Myxopapillary Ependymoma with Anaplastic Features: A Case Series and Review of the Literature.

Abstract

Myxopapillary ependymomas (MPEs) with anaplastic features are rarely reported, with only 21 cases identified to date, and long-term recurrence is rarely presented. A case series is presented to expand understanding of this disease by describing 3 unique cases, including 2 that arose from MPE after a prolonged clinical course. A literature review was performed, and 3 cases of MPE with anaplastic features from our institution were included. Patient 1 was a 13-year-old boy who presented with an avidly enhancing intradural lumbar mass. On gross total resection, the tumor was found to be a solid mass with areas of myxopapillary architecture and MIB-1 (Ki-67) index of 12%. Patient 2 was a woman who initially presented at age 22 with a lumbosacral tumor that was treated with surgery and radiation. A recurrent tumor was resected at age 24. At age 50, the patient presented with a large heterogeneous exophytic mass in the sacrum extending into the presacral space and Ki-67 index of 8%. This was treated with complete resection. Patient 3 was a man who initially presented at age 35 with a lower thoracic, upper lumbar mass at L2 extending into the sacrum. Following resection and radiation, a metastatic focus followed an indolent course until causing pain at the age of 48. Ki-67 index was 16%. The presented cases of MPE with anaplastic features make a total of 24 cases on record in the medical literature and demonstrate 2 examples of late recurrence.