Incidentally diagnosed retroperitoneal alveolar soft part sarcoma

Abstract

A 20-year-old male incidentally diagnosed with left retroperitoneal mass on ultrasound. Computed tomography scan abdomen revealed heterogeneously enhancing left retroperitoneal mass with marginal blood vessels. Histopathological examination of postsurgical tumor specimen showed cells forming pseudoalveolar structures separated from each other by sinusoidal vascular channels suggestive of alveolar soft part sarcoma.