British Journal of Dermatology 1996-Oct
Metastatic skin cancer; a case with signet ring cell histology.
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We report a 64-year-old Japanese man who developed metastatic skin cancer, in the form of 1-3 cm diameter dome-shaped tumours on his face and head. Histopathological examination demonstrated diastase-resistant periodic acid--Schiff and Alcian blue-positive signet ring cells, suggesting gastric carcinoma. Immunohistochemical staining showed that these cells were positive for carbohydrate antigen CA19-9.