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Does The CT Scan Show Acoustic Neuroma?
compute tomography ( CT ) scan is useful in diagnose acoustic neuroma but small acoustic neuroma tumors might not be visible clearly from a CT CAT scan . A large acoustical neuroma tumor is seen as a homogenous enhancement and can be seen well from aCT scan . The direct contrast - heighten CT scan is more exact in detecting acoustic neuroma tumors than the normal CT scan however , tumors less than 1 cm are difficult to visualise even with contrast CT scans . Therefore , in those cases air or gas CT cisternography is require to identify small neoplasm , false negative can occur if there are arachnid adhesions or if the inner acoustic canal is very narrow . The radiation exposure in CT scan is quite high and counterpoint CT scan needs contrast shot has the peril of an allergic reaction . MRI is good in diagnose acoustic neuroma tumors than a CT CAT scan or counterpoint CT scan as the lesions are watch clearly and there is no radiation pic . Some patient role can not undergo anMRI scanif they have metal implants or alloy shrapnel , in that case , a CT can be done.(1 )
How Do They Remove An Acoustic Neuroma?
The principal treatment sensory system of acoustic neuroma is the remotion of the tumor . The whole tumor or part of the tumor can be get rid of look on the size , location andhearing loss , your Dr. will decide which advance is more suitable for you . There are primarily 3 surgical approaches for removal of acoustic neuroma tumor
Translabyrinthine : An incision is made behind the ear and the bone behind the ear and some parts of the mediate ear is off . This procedure is usually used for tumors that are larger than 3 curium . The master advantage of this procedure is that the facial nerve can be figure therefore , damage to the cheek can be avoided . Also , the return rate is nil . The main disadvantage is lasting listening loss . The intraoperative mortality rate is 0 - 2 % in this procedure .
Retrosigmoid/ Sub - Occipital : In this subroutine , the approach is through the back of the skull and the back of the tumor is exposed here . Here , a tumor of any size can be murder while preserving the hearing single-valued function . The mortality rate is about 0.5 % for small tumor excise in this approach .
Middle Fossa : In this procedure , a small part of the skull bone above the ear is removed to get to the ear canal . Small tumors in the internal audile duct which is a narrow passage can be removed . The hearing routine also can be preserve to a significant level from this procedure . The mortality rate is also 0 % .
The near - total or subtotal remotion of the tumor has a regrowth rate of 21 - 22 % and further handling is call for in 2 - 10 % of case . Even with the removal of the whole tumor , there is a recurrence rate of 2.4 - 3%.(2 ) ( 3 ) ( 4 )
What Is The Complication Of Surgery?
Conclusion
cypher imaging ( CT ) scan are utilitarian in diagnosing acoustical neuroma but lowly acoustic neuroma tumors might not be seeable clearly from a CT scan . The direct contrast - enhance CT scan is more accurate in diagnosing acoustical neuroma tumors however lesion less than 2 curium can be difficult . A expectant acoustic neuroma neoplasm is image as a homogenous enhancement and can be seen well from a CT CAT scan . The radiotherapy exposure in CT scan is quite eminent and counterpoint CT scan involve direct contrast injectant has the risk of an sensitized reaction . The master treatment modality of acoustic neuroma is the remotion of the neoplasm . The whole tumor or part of the neoplasm can be removed depend on the size , location and hearing expiration . There are principally 3 surgical approaches for remotion of acoustic neuroma neoplasm : translabyrinthine , retrosigmoid/ torpedo - occipital , middle Cryptoprocta ferox .
The mortality pace is high and there is a risk of lasting hearing loss with translabyrinthine approach . Retrosigmoid carries a mortality rate of 0.5 % and the middle fossa mortality rate pace is 0 % .
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