Figure 6b. Epididymal papillary cystadenoma. (a) US image demonstrates a predominantly solid ovoid mass (M) containing small cystic spaces and located in the head of the epididymis and superior to the testes. (b) US image demonstrates a cystic structure with small papillary projections (arrow). (Case courtesy of Peter L. Choyke, MD, Department of Radiology, Warren G. Magnuson Clinical Center, National Cancer Institute, Bethesda, Maryland.)