Figure 9a. Embryonal rhabdomyosarcoma. (a) US image shows an approximately 3.8 x 1.6-cm isoechoic mass (arrow) adjacent to and encircling the right testicle. The testicle and epididymis are of normal echogenicity. Extensive flow was noted at color Doppler US. (b) T2-weighted MR image demonstrates a large mass that is isointense relative to the testis (arrow). Fibrous septa and lobulations are seen within the mass. The testis is anterolaterally displaced. A small hydrocele is also present. (Case courtesy of D. Gibson, MD, William Beaumont Hospital, Royal Oak, Michigan.) (c) Photograph of the gross specimen of a rhabdomyosarcoma that arose in the spermatic cord of a 5-year-old boy shows a white, glistening, encapsulated tumor with a lobular cut surface (arrow). Scale is in centimeters.