1980 年 19 巻 4 号 p. 561-565
In a patient with gastric cancer, complaining of a painful mass in the right arm two months after operation biopsy was performed in this part. A definite diagnosis was not made and the disease was not thought to be carcinoma like sarcoma. Three months later, he developed a swelling of the chest wall of the right side. The picture of repeated biopsy seemed to be consistent with metastatic carcinoma. The microscopical and cytochemical findings of the cytologic smears and the electron microscopic findings showed typically the epithelial tumor without evidence of sarcoma. The incidence of the gastric cancer metastasis to the skin is low. The histological diagnosis of cutaneous metastasis is often difficult, especially in anaplastic carcinoma. The cytological and electronmicroscopic examinations are helpful to diagnose this kind of metastasis.