Metastasizing to the colon from triple-negative breast cancer: A case report and review of literature

Figure 1 18F-fluorodeoxyglucose positron emission tomography/computed tomography. 18F-fluorodeoxyglucose (FDG) positron emission tomography/computed tomography images didn’t reveal high uptake of FDG in the gastrointestinal tract and other parts of the body in June 2021.

Figure 2 Colonoscopy showing a brittle mass in the ascending colon measuring about 4 cm × 5 cm in size. The mass occupied the entire intestinal lumen. The lumen was narrow, and the colonoscope could not pass through it.

Figure 3 Contrast-enhanced computed tomography. It showing the wall thickening of the ascending colon with a significantly enhanced soft tissue density mass causing an apparent stenosis (arrow).

Figure 4 Colon biopsy. It showing the diagnosis of poorly differentiated adenocarcinoma in the ascending colon.

Figure 5 Immunohistochemical staining of colon specimens. A: Gross cystic disease fluid protein 15; B: GATA-binding protein 3; C: Mammaglobin; D: Cytokeratin 7. Tumor cells were positive.

Figure 6 Immunohistochemical staining of breast cancer specimens. A: Gross cystic disease fluid protein 15; B: GATA-binding protein 3; C: Cytokeratin 7. Tumor cells were positive.