JRSBRT 9.3, p. 261-263

Long-term follow-up after stereotactic radiosurgery for recurrent subependymoma
Claire M. Lanier, Atilio E. Palma, Michael D. Chan and Stephen B. Tatter

Subependymomas are rare, slow growing tumors found within the ventricular system and rarely in the spine. Initially described in 1945 [1], over 100 cases of subependymoma have been reported. Most are small, asymptomatic tumors, often discovered post-mortem [2]. Reports of recurrence are scarce, with only a few discussing treatment with radiation [2-4]. Here we present a patient with a recurrent supratentorial subependymoma who is 15 years out from his initial surgery and 13 years out from salvage stereotactic radiosurgery (SRS). The patient presented with a tumor of the right lateral ventricle and septum pellucidum and underwent craniotomy for maximal safe, sub-total resection. Follow-up MRI at two-years showed progression of the residual and he underwent Gamma Knife-based SRS for successful salvage. Fifteen years after craniotomy and 13 years after SRS, imaging continues to show stability of the residual tumor, demonstrating SRS to be a safe and durable treatment.

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