"Primary sites that lead to gastric metastases include the oesophagus, skin (malignant melanoma - sometimes considered the most common 2), lung, cervix, breast, sigmoid colon, testis 1, renal cell carcinoma 7, prostate 8, ovarian adenocarcinoma 9, and osteosarcoma (very rare) 10"
"polypoid, ulcerated or cavitatory masses"