Fig. 10.

a Secondary tumours to the corpora: renal cell carcinoma metastasis. A 74-year-old man with metastatic renal cell carcinoma presented with hesitation and difficulty in urination as well as a palpable firm mass in the right base of the penis. Axial T1-weighted image after intravenous gadolinium-based contrast administration shows enhancing masses in the bilateral corpora cavernosa (short arrows) and corpus spongiosum (long arrow) as well as in the left ischial tuberosity (arrowhead). The corporal lesions are hypoenhancing relative to adjacent normal corporal tissue however hyperenhancing relative to the nearby musculature. b Secondary tumours to the corpora: renal cell carcinoma metastasis. Histological specimen using Papanicolaou stain shows metastatic carcinoma with clear cell features, consistent with metastatic grade 3 (of 4) renal cell carcinoma. There are clusters of poorly cohesive cells (C) with low nucleo-cytoplasmic ratio, abundant pale cytoplasm and pale, vacuolated background (*)