Other Malignancies

Lymphoma is a mesenchymal process, but has many possible appearances. Typically lesions are lobulated. The mucosa may be intact until late, but ulceration into the soft, cellular tumors is often extensive.

Fig. 8. Multilobulated polypoid gastric adenocarcinoma growing into the lumen
Fig. 9. Infiltrating schirrous gastric carcinoma causing marked thickening and stiffening of the stomach and constricting the lumen. a Single contrast barium upper GI. b CT of same case

Metastases are frequently multiple but can have many appearances, depending upon the primary tumor and whether the lesions are submucosal or serosal. Metastasized breast cancer, in particular, has a tendency to resemble sclerosing mucin-producing adenocarcinoma. Kaposi sarcoma, a soft biphasic mixture of vascular and stromal tissue, tends to form rounded subepithelial nodules in the stomach of HIV positive patients.

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