Melanoma metastasis to medial rectus

Discussion:

This patient had known metastatic melanoma and this deposit is consistent with a metastases. In contrast to uveal metastases which are often bilateral (up to 25%), extraocular orbital metastases are usually unilateral (with the exception of neuroblastoma). Only infrequently primarily involve the extraocular muscles as is the case here.. the tumor that most often does this is melanoma. 

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