Carbamazepine responsive typewriter tinnitus from basilar invagination.


Basilar invagination due to a congenital skeletal disorder kinked the brainstem at the ponto-medullary junction causing both auditory nerves to make an acute turn at the porus acousticus. The associated bilateral asynchronous clicking tinnitus responded to carbamazepine. 
DOI: 10.1136/jnnp.2009.173104

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