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AJNR - American Journal of Neuroradiology

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American Journal of Neuroradiology 26:804-808, April 2005
© 2005 American Society of Neuroradiology

Case Report
BRAIN

MR Imaging of Pial Melanosis Secondary to a Posterior Fossa Melanotic Ependymoma

Sait Albayram^a, Efsun Urger^a, Buge Oz^b, Ali Kafadar^c, Civan Islak and Naci Kocer^a

^a Division of Neuroradiology, Department of Radiology, Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey
^b Department of Pathology, Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey
^c Department of Neurosurgery, Cerrahpasa Medical School, Istanbul University, Istanbul, Turkey

Address correspondence to Sait Albayram, MD, Division of Neuroradiology, Department of Radiology, Cerrahpasa Medical School, 34300 Kocamustafapasa, Istanbul, Turkey

Summary: A 36-year-old man presented with trouble speaking and bilateral progressive hearing loss. MR imaging and histopathologic results revealed a posterior fossa melanotic ependymoma. Pial surfaces appeared hyperintense on T1-weighted images and hypointense on T2-weighted images. Histopathologic examination revealed that tumor cells and interstitial spaces had abundant melanin accumulation. There was no evidence of hemosiderin in tumor cells and in interstitial spaces. Pial melanin accumulation secondary to a posterior fossa melanotic ependymoma explained our MR findings.