Poorly differentiated squamous cell carcinoma of the nipple: a unique case for marked exophytic growth, but little invasion with neuroendocrine differentiation.

A 73-year-old woman showed marked exophytic growth of a tumor (25 × 23 × 14 mm) of the nipple over a period of 2 months. Histologically, numerous tumor nodules with no apparent keratinization were observed in the exophytic lesion. The tumor cells also showed little invasion to the dermis and no metastasis to the axillary lymph nodes (LN). The tumor cells were immunohistochemically positive for cytokeratins (CKs; AE1/AE3 and 34ßE12), epithelial membrane antigen (EMA), and p53, but negative for Ber-EP4 and human papilloma virus (HPV). The MIB-1 index was 56%. Some tumor cells were also positive for some neuroendocrine markers, and showed some tonofilaments and neurosecretory granules in the cytoplasm under electron microscopy. We made the differential diagnosis of mammary ductal carcinoma, basal cell carcinoma (BCC), Paget's disease, and neuroendocrine carcinoma including Merkel cell carcinoma. The final diagnosis was poorly differentiated squamous cell carcinoma (SCC) showing exophytic growth with neuroendocrine differentiation (ND) in the nipple. To our knowledge, although only five cases of Bowen's disease have been reported in the nipple, such a unique SCC has not been reported previously.

[A case of emphysematous cholecystitis with cholecystic arterial thromboses and gallbladder infarction].

We report a case of emphysematous cholecystitis (EC). An 82-year-old woman was hospitalized for subarachnoidal hemorrhage. She presented with fever, vomiting, hypotension, and slight abdominal tenderness in the right upper quadrant. Abdominal computed tomography (CT) revealed the air-fluid level in the lumen of the gallbladder and gas around the wall. The patient underwent cholecystectomy. Laparotomy revealed necrotic changes in the gallbladder. A bile culture revealed Clostridium species infection. The histopathological findings were multiple arterial thromboses and gallbladder infarction. The pathogenesis of EC is controversial, but many cases of emphysematous cholecystitis were acalculous and have been reported in individuals with a history of diabetes mellitus, hypertension, cerebrovasucular accidents, or ischemic heart disease. We consider that the case presented here proves the hypothesis that ischemia and necrotic changes may occur in the gallbladder due to a primary vascular compromise, and that gas-producing bacteria grow under anaerobic conditions, resulting in the development of EC.

[A case of perforated gastric cancer in which resection for elimination was possible S-1/CDDP combined chemotherapy for peritonitis carcinomatosa].

The present patient was a 66-year-old male with sudden upper abdominal pain. The patient was diagnosed with perforated peritonitis at another hospital, and an emergency laparotomy was performed to confirm upper gastrointestinal tract perforation. A perforated lesion of approximately 1 cm in diameter was found on the anterior wall at the gastric upper body. The area surrounding the lesion was tumor-like. Malignancy was suspected; however, considering the patient's general status, greater omentum grafts were opted for. The patient was diagnosed with typeIII gastric cancer by gastroendoscopy postoperatively. A second surgery was performed after one month, but during laparotomy peritonitis carcinomatosa and metastastic nodules were found around the abdominal aorta. S-1/CDDP therapy was started on the 14th day after second surgery. After three courses of treatment, the tumor was found to have smoothened, wall consolidation was improved, and a third surgery was performed. During laparotomy, there were no other medical findings that raised suspicion of peritoneal dissemination or liver metastasis. It was concluded that radical surgery was possible, and distal gastrectomy(D2+a)was performed. Pathological examination revealed that poorly differentiated adenocarcinoma. The lower and muscle layers of the serous membrane and nodules around the abdominal aorta showed the disappearance of cancer cells. But the peritonitis carcinomatosa during second surgery had pathologically / changed the fibrosis tissue at the third surgery.