Incidental Gastric Signet-ring Cell Carcinoma Metastasis to the Skin in Basal Cell Carcinoma

Signet‐ring cell gastric adenocarcinoma metastasizing into a primary cutaneous squamous cell carcinoma of the scalp

“…Richardson and Katayama 7 found that the host tumor was a benign neoplasm more frequently than a malignant one. Table 1 8–18 summarizes all previously reported cases of tumor‐to‐tumor metastasis in which a cutaneous or subcutaneous neoplasm served as the recipient. Although the case reported by Kabukcuoglu et al 14 was a breast carcinoma metastasizing into a subcutaneous myxoid liposarcoma, the images presented are insufficient to confirm that the case is fully credible.…”

“…In our analysis, we have only found four previously reported cases with a malignant cutaneous or subcutaneous tumor functioning as the recipient. One case was a melanoma that metastasized into a basal cell carcinoma, 11 one showed metastatic breast carcinoma within myxoid liposarcoma, 14 one showed metastatic pulmonary adenocarcinoma within basal cell carcinoma 17 and one showed gastric signet‐ring carcinoma secondarily involving basal cell carcinoma 18 …”

Signet‐ring cell gastric adenocarcinoma metastasizing into a primary cutaneous squamous cell carcinoma of the scalp

“…One case was a melanoma that metastasized into a basal cell carcinoma, 11 one showed metastatic breast carcinoma within myxoid liposarcoma, 14 one showed metastatic pulmonary adenocarcinoma within basal cell carcinoma 17 and one showed gastric signet-ring carcinoma secondarily involving basal cell carcinoma. 18 Gastric adenocarcinoma represents the most common malignancy to assume signet-ring morphology, although virtually any adenocarcinoma may show foci of signet-ring cell change. 19 Many cutaneous tumors may contain signet-ring cells, including squamous cell carcinoma, basal cell carcinoma, melanocytic nevi, melanoma, liposarcoma, hidradenoma, cylindroma and lymphoma.…”