Intracranial dermoid cysts are rare dysembryonic tumors of benign nature. These are
uncommon in adults. If present, they are usually located in the midline or along the
lines of embryonic fusion. The posterior fossa region is an infrequent site. Extradural
or interdural locations are even more rare. In this case report, the authors report
a laterally located large posterior fossa right cerebellar convexity interdural and
extradural dermoid cyst over the sigmoid sinus. It was managed by totally extradural
maximum possible safe decompression with microneurosurgical technique. The authors
share their experience of addressing this rare pathology at the rarest location with
unusual imaging findings.
Keywords
cerebellar convexity - dermoid cyst - epidermoid - extradural - interdural - maximum
safe decompression - microneurosurgery - posterior fossa - sigmoid sinus - total resection
