Diagnosis: Embryonal rhabdomyosarcoma.        

            Comments: This is the most frequent sarcoma in paratesticular location in children. In adults the most frequent sarcoma is liposarcoma and the second leiomyosarcoma. Embryonal rhabdomyosarcoma shows primitive cells with small round to oval hyperchromatic cells or spindle cells alternating cellular and less cellular areas. Round cells with eosinophilic cytoplasm are more differentiated cells (rhabdomyoblasts) seen in Figs. 3 and 4. The tumor showed strong positivity for desmin (Fig. 5A), HHF35 (Fig. 5B) and myoglobin. Paratesticular rhabdomyosarcoma has significantly better prognosis than tumors in other locations of the genitourinary tract. The prognosis is better in children less than 10 years of age and less than 5 cm in diameter.