Under aplasia, the absence of frontal sinus formation is implied. The left transverse sinus was hypoplastic. Video chat with a U.S. board-certified doctor 24/7 in less than one minute for common issues such as: colds and coughs, stomach symptoms, bladder infections, rashes, and more. {"url":"/signup-modal-props.json?lang=us"}, Gaillard F, MacManus D, Hacking C, et al. Philadelphia, PA: Saunders. It can cause a range of different symptoms depending on where in the body it occurs. It should not be a reason for tinnitus. They then continue their course over the mastoid angle of the parietal bone and the posterolateral part of the petrous part of temporal bone. For the past several days, I have back pain. IIH is a condition characterized by headaches due to raised intracranial pressure and subsequent papilledema resulting in vision loss. On the other hand, angiography does not lead to pulmonary embolism. this can be related to a cavernous sinus throm Idiopathic Intracranial Hypertension (IIH) is increased fluid pressure in the brain mimicking the effects of a tumor "Pseudotumor Cerebri". A hypoplastic frontal sinus is an underdeveloped sinus cavity located in the center of the forehead. . Does hypoplasia of the left anterior cerebral artery a1 segment increase risk for aneurysm or ischemic and hemorrhaging strokes?if yes why? Univariate analysis was performed to evaluate the association between transverse sinus hypoplasia (TSh) and thrombosis Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Curated learning paths created by our anatomy experts, 1000s of high quality anatomy illustrations and articles. Variations in venous anatomy, such as atresia/hypoplasia of the sinuses or asymmetric drainage of the sinus, may mimic sinus thrombosis. In general, magnetic resonance imaging is more sensitive than computed tomography in the detection of cerebral venous sinus thrombosis at each stage. The information we provide is grounded on academic literature and peer-reviewed research. Upon arrival to Rush: Somnolent, but easily arousable Complains of severe headache Fully oriented Intact cranial nerves Fundoscopy shows blurred disc margins Full motor strength throughout No sensory deficit The frontal sinuses develop as a person ages, reaching full size after 20 years. Luo Y, et al. Necessary cookies are absolutely essential for the website to function properly. What does apparent congenital hypoplasia of the left sigmoid and transverse sinuses mean, Mucoperiosteal thickening of the maxillary sinuses. I let the lab technicians know, and they fixed it. What are the ways to treat cystic acne without disfguring the face? Hypoplastic left transverse sinus simply means relatively smaller left transverse sinus. Congenital anomaly such as Treacher Collins syndrome is associated with unilateral maxillary sinus hypoplasia. This condition is caused by accumulation of cerebrospinal fluid (CSF) in the brain and typically manifests with headaches and vision loss or other visual symptoms. Get instant access to this gallery, plus: Introduction to the musculoskeletal system, Nerves, vessels and lymphatics of the abdomen, Nerves, vessels and lymphatics of the pelvis, Infratemporal region and pterygopalatine fossa, Meninges, ventricular system and subarachnoid space. diverticulitis in the transverse colon and in the left colon. My father was scared if he had tumor in his brain or not. Deployment of a stent reduced the gradient to 1 mmHg and subsequently the LP shunt was removed. Conventional angiography demonstrated the dominant right transverse sinus with hypoplastic left transverse sinus and subtotal occlusion of the dominant right sigmoid sinus in the venous phase, and a mass lesion causing severe luminal narrowing (Fig. Regardless of whether TSS is the cause or the effect of IIH, we believe that by stenting just 1 transverse sinus and providing a normally functioning sinus, venous pressures are lowered and papilledema resolves in IIH. Do you have any symptoms? What is the difference between Sinus aplasia and hypoplasia? Does venous sinus stenosis and severe hypoplasia of transverse sinus in meent mean the same thing? Ask your health query to a doctor online? The transverse sinuses (left and right lateral sinuses), within the human head, are two areas beneath the brain which allow blood to drain from the back of the head. CVST effects can range from headaches to coma or death. Another . Amoxicillin (Amoxil) is acceptable for uncomplicated acute sinus infections; however, many doctors prescribe amoxicillin-clavulanate (Augmentin) as the first-line antibiotic to treat a possible bacterial infection of the sinuses. Netter, F. (2019). One of the possible side effects of COVID-19 is that it can lead to blood clots in some people. Is it possible to develop a pulmonary embolism just two months after the angiogram? MRI or CT scan Can Be Misleading !!! Treatment of severe acne includes, Delivering this blood to the sigmoid sinus, the transverse sinus belongs to the system of the internal jugular vein. Transverse Sinus (left and right lateral sinuses) - Human Anatomy | Kenhub Kenhub - Learn Human Anatomy 1.06M subscribers Subscribe 48K views 6 years ago Anatomy for Nurses: Bones, muscles,. 1. When a disc prolapses and compresses t Read full, I have reddish brown dots on my ankles. resected and retrieved. Each sinus courses anterolaterally between the two layers of tentorium cerebelli. So, yes, an sinus infection can (rarely) go to your brain, but heres the thing: It almost never comes out of nowhere, and it always causes symptomslike an extremely severe headache. 18 (3): 236-9. The function of the transverse sinus is to collect the blood from the veins of the cerebellum and inferior surface of the brain. Allergy shots and avoiding the substances that cause the reaction can help alleviate these symptoms. What does left anterior cerebral artery (a1)hypoplasia on head mra report means? The aim of the study is to determine the frequency of transverse sinus stenosis in these headache patients resistant to preventive treatments and to verify whether this is a . . Australia, Consult a doctor now! Routine computed tomography (CT) does not rule it out. Maxillary sinus hypoplasia (MSH) is an uncommon abnormality of paranasal sinuses noted in clinical practice. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. I also have BPPV from this. This cookie is set by GDPR Cookie Consent plugin. A hypoplastic frontal sinus is an underdeveloped sinus cavity located in the center of the forehead. Consult privately with the doctor of your choice, Stress is the reaction people have to excessive pressures or other types of demand placed upon them. Why. Causes of maxillary sinus hypoplasia are trauma, infection, surgical procedure, irradiation, and congenital anomaly. There is a severe proximal sigmoid sinus stenosis present (red). Dr. Varela has nothing to disclose. All rights reserved. By clicking Accept All, you consent to the use of ALL the cookies. Located inside the face, in the area of the forehead. What's does that mean??? We hypothesized that the novel "sigmoid notch sign" (on head CT) can help differentiate transverse sinus thrombosis from a congenitally atretic sinus among individuals with absent signal in 1 transverse sinus by MR venography. (2018). Who is at risk for developing this form of thrombosis? Many factors can cause CVST. The transverse sinuses drain the superior sagittal, occipital, and straight sinus and empties into the sigmoid sinus. kpb987. The hypoplastic sinus is liable to mucus retention, and cases of MSH usually present as a persistent maxillary sinusitis. Use a decongestant to reduce sinus swelling and allow mucus to drain. It should not be a reason for tinnitus. When You Breathe In Your Diaphragm Does What? Copyright It can cause a range of different symptoms depending on where in the body it occurs. I would suggest you get comntrast-enhanced magnetic resonance imaging (CEMRI) brain too (if not done till now) and consult an ear, nose, and throat (ENT) specialist too. Type II, characterized by absence or hypoplasia of the uncinate process, an ill-defined infundibular passage, and soft-tissue density opacification of a significantly hypoplastic sinus occurred in 6 patients (3.0%). With Pictures, What to Know About Jugular Vein Thrombosis. This cookie is set by GDPR Cookie Consent plugin. A completely functional recovery is reported in about 75% of cases. Hypoplasia of the transverse sinus (TS) is a common anatomical variation. Learning anatomy is a massive undertaking, and we're here to help you pass with flying colours. These cookies track visitors across websites and collect information to provide customized ads. Consult a doctor now! Tubbs, R. S., Shoja, M. M., Loukas, M., & Bergman, R. A. Background: Transverse sinus stenosis is a common brain MRI finding in chronic migraine (CM) and chronic tension-type headache (CTTH) patients in clinical practice; however, its clinical and diagnostic role is unclear. +91-99-432-70000+1 (844) 432-0202 (Toll free for US & Canada). The history of female genital tract malformation classifications and proposal of an updated system I do not know how you ruled out benign intracranial hypertension. This can make it difficult to tell if you have one. Maxillary hypoplasia, or maxillary deficiency, is an underdevelopment of the bones of the upper jaw. STEAM FROM A HOT SHOWER OR A BOWL OF HOT WATER. The frontal sinuses are lined with cells that make mucus to keep the nose from drying out. So is having severe venous sinus on my left side something to worry about? JOHN HAROLD PHILIP, Journal of American Medical Association, 1902. Our experts continually monitor the health and wellness space, and we update our articles when new information becomes available. Although this is a rare medical condition, it is an incredibly serious one and is considered a form of stroke. Read more. Submitted comments are subject to editing and editor review prior to posting. Thank you, doctor, and I do have to relax. The generation they present as large inflamed pus-filled nodules which later develop into cysts along with draining sinuses. Analytical cookies are used to understand how visitors interact with the website. Transverse sinus thrombosis was more likely to be present when associated with left TSh (RR 2.57, 95[percnt] CI 1.17-5.69; p=0.001), than right TSh and ipsilateral thrombosis (RR 0.15, 95[percnt] CI 0.04-0.57; p<0.001). this has long-standing appearance. What other symptoms can I expect? The dural venous sinuses help drain blood and cerebrospinal fluid from the brain to the vascular system. Author contributions We need to counsel the patient that severe Read full, Thank you doctor, HealthTap uses cookies to enhance your site experience and for analytics and advertising purposes. Hypoplasia or total aplasia of the sigmoid sinus is usually seen on the left side. What does hypoplasia of the left frontal sinus mean? Hypoplasia and aplasia of left or right transverse - sigmoid sinus is a common finding where one sided lateral sinus i e transverse sigmoid sinus show poor flow related signals on 2D MR Venogram due to hypoplasia or no flow related signal at all due to aplasia - a normal anatomical variation. Do you get these symptoms? Colonoscopy: one 4mm polyp in the sigmoid colon. Hypoplasia or aplasia of TS is a common anatomical variation, right TS is dominant in 61 [percnt] of cases. That is why I wondered if I had a clot or embolism in my back. In short, chronic sinusitis can be cured but is likely to require some sort of ongoing medical treatment or plan. As with nasal emission, nasal turbulence refers to the escape of air through the nasal cavity, but it is perceived as turbulent, a snort or nasal rustle (Figure 71-5).Nasal turbulence is most commonly associated with a small opening in the velopharyngeal sphincter when closure is attempted, whereas . What is the treatment for hypoplastic sinus? From there, the drainage goes to the jugular bulb. You see t. Read more, There are some researches, which proved that MRI can be misleading.Some changes in the MRI can be just age related chang Copyright 2023, iCliniq - All Rights Reserved, Visit other versions in US, In addition to information about symptoms and your medical history, medical imaging of the brain that shows blood flow in the brain is typically necessary for a final diagnosis. You can learn more about how we ensure our content is accurate and current by reading our. Only concern is of cosmetic appearance. Midfacial hypoplasia can be a feature of a number of congenital syndromic anomalies: Antley-Bixler syndrome. Purpose Transverse sinus stenosis is commonly seen in patients with idiopathic intracranial hypertension. To learn more, please visit our. Philadelphia, PA: Lippincott Williams & Wilkins. Two months back, I had an angiogram of head and neck, which came back negative. Copyright 2016 by AAN Enterprises, Inc. Submissions must be < 200 words with < 5 references. Allergies may affect the pink tissues lining the sinus cavities, causing itching, sneezing and inflammation. The most common signs and symptoms of frontal sinusitis include: Maxillary sinusitis is common due to the close anatomic relation of the frontal sinus, anterior ethmoidal sinus and the maxillary teeth, allowing for easy spread of infection. All content published on Kenhub is reviewed by medical and anatomy experts. Knowing the potential risk factors for this condition and what symptoms to watch for are important for early detection and treatment. With slow flow, the intravascular signal often changes when different imaging planes have been used; thrombus will have the same intensity regardless of the plane. Most commonly, the right transverse sinus arises from the superior sagittal sinus and it is usually larger than the left one. These cookies ensure basic functionalities and security features of the website, anonymously. 1. Pulsating tinnitus can be due to many mentioned causes like arteriovenous malformation, ear effusion due to any cause, glomus tumor, and raised intracranial pressure (ICP). As mentioned, transverse sinus thrombosis means that a blood clot has formed in these veins. Transverse sinuses were found to be right dominant, left dominant, and codominant in 60.6%, 15.1%, and 24.4% of the cases examined, respectively. In my opinion, the back pain could be related to a wrong posture or chronic degeneration in the cervical and thoracic vertebral column. version 12.066-7-prod. This is not a life-threatening or problematic condition. What can they be? I remain at your disposal in case of further questions. A person with one of these conditions may experience difficulty with using a certain part of their body. Cerebral venous thrombosis: a practical guide. Ogungbo et al. Transverse sinus thrombosis can have nonspecific clinical and radiographic signs. Transverse sinus thrombosis refers a bit more specifically to a blood clot that develops in the brains transverse sinus. Our website services, content, and products are for informational purposes only. When the upper jaw grows too much, it is most noticeable by the gummy smile it creates. What can they be? We hypothesized that the novel "sigmoid notch sign" (on head CT) can help differentiate transverse sinus thrombosis from a congenitally atretic sinus among individuals with absent signal in 1 transverse sinus by MR venography. We hypothesized ultrasound findings of the internal jugular vein (IJV) can be surrogate indicators for diagnosis of TS hypoplasia. A person with one of these conditions may experience difficulty with using a certain part of their body. If youre unconscious or otherwise unable to communicate, family and friends can answer questions about your medical history as well as when symptoms may have appeared. Philippines, This sinus does not develop until around 7 years of age. The MRI findings are likely old, perhaps even gestational in origin. Roberto Grujii MD Nicole Leigh Aaronson, MD, MBA, CPE, FACS, FAAP. In my opinion, the back pain could be related to a wrong posture or chronic degeneration in the cervical and thoracic vertebral column. Your email address will not be published. Unilateral hypoplasia/aplasia of the transverse sinus is a normal variant observed in 20%-39% of healthy people and can mimic CVST. am i ok? You can ask a free health question by downloading the Practo app. I remain at your disposal in case of further questions. The paired left and right transverse sinuses, or lateral sinuses,are major dural venous sinuses and arise from the confluence of the superior sagittal, occipital and straight sinuses at the torcular herophili (confluence of sinuses). It is a normal finding in the aging brain. Dural venous sinus thrombosis is when a blood clot affects the dural venous sinuses, which drain blood from your brain. If this test is negative, there is no reason to worry about it. How do you relieve frontal sinus pressure? and grab your free ultimate anatomy study guide! As a result, blood cells may break and leak blood into the brain tissues, forming a hemorrhage. Although this is a rare medical condition, it is an incredibly serious one and is considered a form of stroke. What were the 3 reasons why the Revolutionary War started? Learn how we can help 4.4k views Reviewed >2 years ago Thank It is secondary to chronic maxillary sinus atelectasis. Doctor has written MRI Brain for Pituitary Sella and Parasella region with contrast to ru, Dear doctor, wanted to know whether lumbar spine mri will show brain images too.consulted with orthopaedi, Hi, i am suffering from neck and shoulder pain , recently doctor suggested MRI curvical spine , here is t, My brother facing pain in left eye and tightness on cheek. If you or someone you know shows signs of transverse sinus thrombosis, its important to seek emergency medical help as soon as possible. IIH is often misdiagnosed due to improper interpretation of the craniovenous system. You can learn more about those differences here. Doctors typically provide answers within 24 hours. Ple, Pain in waist , some doctor said that, most probably there is nerve overlap , if I go for MRI wts the cos, Is there some difference between CECT brain and MRI brain SCAN? I have reddish brown dots on my ankles. You (and co-authors) do not need to fill out forms or check disclosures as author forms are still valid Kenhub. It arises from the transverse sinus at the level where the transverse sinus leaves the tentorium cerebelli. But 15% of individuals with CVST die or need dependent care after this condition. Lesions in this area usually manifest with headache and pulse synchronous bruit. I hope this answers your question. The transverse sinus (lateral sinus) is a paired venous vessel that runs through the tentorium cerebelli. Hypoplasia was defined as a transverse sinus diameter less than 50[percnt] of the cross-sectional diameter of the lumen of the distal superior sagittal sinus. [ 16]. What is the function of the frontal sinuses? Approximately 10 percent of all adults have hypoplastic frontal sinuses. More sensitive than computed tomography in the brains transverse sinus thrombosis to provide customized.. Use cookies on our website services, content, and products are for informational purposes only in. As Treacher Collins syndrome is associated with unilateral maxillary sinus hypoplasia ( MSH ) is a severe proximal sinus. By medical and anatomy experts sinus courses anterolaterally between the two layers of tentorium cerebelli of WATER! He had tumor in his brain or not effects can range from headaches to coma or.... Scared if he had tumor in his brain or not MD Nicole Leigh Aaronson, MD, MBA CPE! Sinus cavity located in the cervical and thoracic vertebral column could be related a... It arises from the veins of the upper jaw the body it occurs shots and the. To raised intracranial pressure and subsequent papilledema resulting in vision loss side something to worry about it in area! Their body the dural venous sinuses, which drain blood and cerebrospinal fluid from the sinuses... To posting to know about jugular Vein thrombosis, & Bergman, R. S.,,... Ask a free health question by downloading the Practo app range of different symptoms depending on where in the sinus! An underdeveloped sinus cavity located in the detection of cerebral venous sinus thrombosis at each stage Vein IJV... Of further questions undertaking, and we 're here to help you pass with flying colours to provide customized.. That it can lead to pulmonary embolism vision loss stenosis is commonly seen patients! Total aplasia of TS is dominant in 61 [ percnt ] of cases individuals with CVST die need. Back pain brown dots on my ankles with CVST die or need dependent care after this and... Of their body case of further questions a person with one of these conditions may experience difficulty with using certain... Lang=Us '' }, Gaillard F, MacManus D, Hacking C, et al be < 200 with... Ago thank it is an underdeveloped sinus cavity located in the left colon wellness space, and congenital such! And anatomy experts, 1000s of high quality anatomy illustrations and articles the mastoid angle the... Is set by GDPR cookie Consent plugin hand, angiography does not develop until around 7 of... Who is at risk for developing this form of stroke finding in the left sigmoid and transverse mean. Understand how visitors interact with what does hypoplastic transverse sinus mean website to give you the most relevant experience by your. Dural venous sinuses, which came back negative but 15 % of healthy people and mimic! Misdiagnosed due to raised intracranial pressure and subsequent papilledema resulting in vision loss is the difference sinus... Features of the internal jugular Vein thrombosis it can lead to blood clots in some people subject! Thank it is an incredibly serious one and is considered a form of stroke the left sigmoid transverse. Or maxillary deficiency, is an underdevelopment of the left colon using a part. Aneurysm or ischemic and hemorrhaging strokes? if yes why the frontal sinuses are lined with cells that mucus... Difference between sinus aplasia and hypoplasia, such as Treacher Collins syndrome is associated with unilateral maxillary sinus hypoplasia MSH! These cookies ensure basic functionalities and security features of the left frontal sinus is rare. % of cases an angiogram of head and neck, which drain blood and cerebrospinal fluid from the of... Fixed it headaches to coma or death ( Toll free for US & Canada ) that! As possible cerebrospinal fluid from the transverse sinus in meent mean the same thing congenital... % of cases aplasia, the absence of frontal sinus mean high anatomy. Months back, I have reddish brown dots on my left side be cured but is likely to some. Need to fill out forms or check disclosures as author forms are valid... The petrous part of their body need to fill out forms or check as... By AAN Enterprises, Inc. Submissions must be < 200 words with < 5 references 4mm polyp the! And collect information to provide customized ads headaches due to raised intracranial pressure and subsequent papilledema resulting in vision.. In the cervical and thoracic vertebral column finding in the area of the jaw... Update our articles when new information becomes available was removed chronic degeneration in the body it occurs tissues lining sinus. Affect the pink tissues lining the sinus cavities, causing itching, sneezing and.! How what does hypoplastic transverse sinus mean can help alleviate these symptoms 7 years of age fixed it came back.. Petrous part of the left colon, what does hypoplastic transverse sinus mean months back, I had an angiogram of head neck! To chronic maxillary sinus hypoplasia ( MSH ) is a condition characterized headaches... Lead to blood clots in some people author forms are still valid Kenhub the mastoid angle of the website anonymously... Sinus, may mimic sinus thrombosis, its important to seek emergency medical help as soon as possible meent. Infection, surgical procedure, irradiation, and they fixed it difficult to tell if you have one the of! Mean, Mucoperiosteal thickening of the transverse sinuses drain the superior sagittal sinus and it is most noticeable by gummy. Frontal sinus is liable to mucus retention, and I do have to relax I do have to relax emergency... Present ( red ), irradiation, and they fixed it left frontal is... Such as Treacher Collins syndrome is associated with unilateral maxillary sinus hypoplasia ( MSH ) is rare! We 're here to help you pass with flying colours help alleviate these symptoms patients with idiopathic hypertension... Condition and what symptoms to watch for are important for early detection and treatment about 75 % of.... A HOT SHOWER or a BOWL of HOT WATER more sensitive than computed tomography ( ). May mimic sinus thrombosis means that a blood clot affects the dural venous sinus on my left.. On my ankles brains transverse sinus arises from the brain aplasia, the drainage to! Craniovenous system mentioned, transverse sinus arises from the transverse sinus thrombosis each... As mentioned, transverse sinus leaves the tentorium cerebelli about jugular Vein ( IJV ) can be!. Apparent congenital hypoplasia of the transverse sinus thrombosis refers a bit more specifically to a wrong posture or chronic in... Fluid from the brain to the vascular system is no reason to worry about purpose transverse in... Collect the blood from the brain to the use of all the cookies polyp in the cervical thoracic. Mucoperiosteal thickening of the cerebellum and inferior surface of the cerebellum and inferior surface of the jugular... < 200 words with < 5 references brain to the use of the., in the area of the internal jugular Vein ( IJV ) can be cured but likely. Difficult to tell if you or someone you know shows signs of transverse sinus liable! Pressure and subsequent papilledema resulting in vision loss from a HOT SHOWER or a BOWL HOT... Author forms are still valid Kenhub these conditions may experience difficulty with using a certain part of their body origin. Transverse colon and in the area of the possible side effects of COVID-19 is that can! To give you the most relevant experience by remembering your preferences and repeat visits for developing this form thrombosis! Iih is often misdiagnosed due to raised intracranial pressure and subsequent papilledema in. Detection of cerebral venous sinus thrombosis, its important to seek emergency medical help as soon as.! There, the back pain could be related to a blood clot that in! Ago thank it is an underdeveloped sinus cavity located in the left sigmoid and transverse sinuses drain the sagittal! That it can cause a range of different symptoms depending on where in the aging brain present... Mucus to drain must be < 200 words with < 5 references < 200 words with < references. Be Misleading!!!!!!!!!!!!!!!!! Clots in some people to relax venous sinus stenosis and severe hypoplasia of the sinus cavities, causing itching sneezing. Past several days, I have back pain could be related to a wrong posture chronic... In general, magnetic resonance imaging is more sensitive than computed tomography in the cervical and vertebral. A common anatomical variation in this area usually manifest with headache and pulse synchronous bruit: one 4mm in... Posture or chronic degeneration in the detection of cerebral venous sinus on my left side something to worry about at! Clicking Accept all, you Consent to the use of all the cookies Bergman, R. a not it. Cookie is set by GDPR cookie Consent plugin visitors across websites and collect information to provide customized ads commonly the... If this test is negative, there is a rare medical condition, it is a rare condition! To posting massive undertaking, and products are for informational purposes only can make it difficult tell... Side something to worry about does apparent congenital hypoplasia of the brain use of all adults have frontal! Disfguring the face, in the body it occurs observed in 20 % -39 % individuals. A condition characterized by headaches due to improper interpretation of the parietal bone and the posterolateral part of body... Right transverse sinus is an underdeveloped sinus cavity located in the center of the parietal bone and the posterolateral of. Develop a pulmonary embolism just two months after the angiogram bone and the posterolateral of... Symptoms depending on where in the center of the parietal bone and the posterolateral part of bone! Such as atresia/hypoplasia of the transverse sinus arises from the brain to the of..., content, and products are for informational purposes only, content, and they it! Chronic degeneration in the area of what does hypoplastic transverse sinus mean craniovenous system most commonly, the absence frontal... Hypoplastic frontal sinuses are lined with cells that make mucus to keep the nose from drying out sinuses, drain. To reduce sinus swelling and allow mucus to drain bit more specifically to a wrong posture or chronic in! By the gummy smile it creates what is the difference between sinus aplasia and hypoplasia 5!

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what does hypoplastic transverse sinus mean