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The purpose of this study was to evaluate the frequencies of various types of orbital lesions seen at a comprehensive cancer center in the United States.

In this retrospective case series, we reviewed the medical records of 268 consecutive patients referred to our orbital oncology service for evaluation of an orbital mass between November 1998 and February 2009. Each orbital lesion was documented by CT and/or MRI, and in most cases diagnosis was established with a tissue biopsy. Patients who were seen for second opinions and had inadequate follow‐up data were excluded, as were patients with thyroid eye disease or orbital hemorrhage.

The study included 134 men and 134 women aged 1 to 89 years at diagnosis (median, 55 years). Follow‐up ranged from 0.06 to 192 months (median, 15 months). Of the tumors, 171 (64%) were primary orbital, 69 (26%) were secondary …