Uncommon metastatic pattern of renal cell carcinoma (simultaneous metastasis to the small intestine and skeletal muscle): A case report

Figure 1 Intermittently oozing and irregular appearing folds in the duodenum.

Figure 2 Small bowel biopsy showing submucosal metastatic clear cell renal carcinoma, polypoid mucosa with moderate acute and chronic inflammation. A: Hematoxylin and eosin (HE) stain (4 ×); B: HE stain (40 ×).

Figure 3 Abdominal magnetic resonance imaging showing a 3 cm mass within the right psoas muscle.

Figure 4 Mass, right psoas muscle core biopsy showing focal skeletal muscle involvement by atypical cells with hyperchromatic, mildly irregular nuclei, occasional inconspicuous nucleoli and clear abundant cytoplasm associated with a fine vascular network. Findings consistent with metastatic clear cell renal cell carcinoma. A: Hematoxylin and eosin (HE) stain (10 ×); B: HE stain (40 ×).