Spontaneous hematomas are rare and can present with acute or chronic sympto
ms. Our patient presented with deep vein thrombosis of the lower extremity
associated with a spontaneous pelvic hematoma. This lesion was radiological
ly and clinically indistinguishable from a soft-tissue neoplasm. The case o
f a spontaneous pelvic neoplasm in an otherwise healthy young man is presen
ted and the literature reviewed regarding issues of differential diagnosis
and clinical management.