Desmoplastic small cell tumor (DSCT) is a rare neoplasm which usually arises in the abdomen and typically affects young males. We report the imaging findings of a 14- year-old boy with this uncommon tumor. A huge abdominal mass with peritoneal implantations, extensive metastatic lymphadenopathies, and a solitary liver metastasis were evident on ultrasound and CT scan. Diffuse, tiny punctate calcified spots within the tumor were well demonstrated on CT and ultrasound, which have not been seen in most DSCTs reported before. The imaging findings of a large mass with no obvious origin in a young male patient should alert the radiologist to include this disease in the differential diagnosis.