An orbital hemangiopericytoma recurrent after 33 years

A middle-aged woman developed a recurrent orbital hemangiopericytoma 33 years following its initial removal. Preoperative computed tomographic and magnetic resonance imaging scans revealed a well-circumscribed superotemporal orbital mass. A tumor that appeared grossly encapsulated was removed intact via a lateral orbitotomy. Histopathological examination showed a hemangiopericytoma with hypercellularity and a moderate number of mitotic figures. A review of the initial pathologic report confirmed the diagnosis of hemangiopericytoma with histological features similar to those of the recurrent mass. To our knowledge, this case represents the longest reported interval to recurrence of any hemangiopericytoma and demonstrates the extended follow-up needed in patients with hemangiopericytoma.