Calcifying pseudoneoplasms of the neuraxis (CAPNONs) are uncommon benign lesions that
are rarely diagnosed radiographically. We report an unusual case of a left middle
cerebellar peduncle CAPNON with vasogenic edema and a perilesional cyst. The patient
was a 36-year-old woman with a 20-year history of left-sided hearing loss that had
recently progressed. Computed tomography and magnetic resonance imaging showed a heterogenous
calcified lesion with vasogenic edema and a perilesional cyst in the left middle cerebellar
peduncle. Although it is a rare radiographic feature of CAPNON, vasogenic edema should
be included as a possible feature of this uncommon tumefactive lesion.
Keywords
calcifying pseudoneoplasms - case report - CAPNON - microsurgery - perilesional cyst
- vasogenic edema