Differentiated adenocarcinoma with a gastric phenotype in the stomach: difficulties in clinical and pathological diagnoses |
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Authors: | Tsutomu Namikawa Michiya Kobayashi Hiroyuki Kitagawa Takehiro Okabayashi Takeki Sugimoto Yoshinori Kuratani Manabu Matsumoto Kazuhiro Hanazaki |
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Affiliation: | (1) Department of Surgery, Kochi Medical School, Kohasu-Okocho, Nankoku Kochi, 783-8505, Japan;(2) Department of Human Health and Medical Sciences, Kochi Medical School, Nankoku, Kochi, Japan;(3) Department of Gastroenterology and Hepatology, Kochi Medical School, Nankoku, Kochi, Japan;(4) Laboratory of Diagnostic Pathology, Kochi Medical School Hospital, Nankoku, Kochi, Japan |
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Abstract: | Differentiated-type adenocarcinoma with gastric phenotype of the stomach is rare and is difficult to diagnose both clinically and pathologically. We report a case of differentiated-type adenocarcinoma with a gastric phenotype in the stomach. A 60-year-old Japanese female was referred to our hospital with gastric cancer. A barium meal examination and esophagogastroduodenoscopy revealed a granular elevated lesion in the lower body near the lesser curvature and a depressed lesion on the antrum. A biopsy specimen showed benign atrophic mucosa in a granulated lesion and moderately differentiated adenocarcinoma in the depressed lesion. The patient underwent laparoscopy-assisted distal gastrectomy with lymph node dissection. The postoperative course was uneventful. Histological examination of the resected tissue confirmed well-differentiated adenocarcinoma in the granulated lesion and moderately differentiated adenocarcinoma in the depressed lesion, without lymph node metastasis. Both lesions were confined to the mucosa. Since mucin immunohistochemistry revealed MUC5AC-positive staining in the granulated lesion, the final diagnosis was differentiated-type adenocarcinoma with gastric phenotype in the stomach. Despite the high malignant potential, the clinical and pathological diagnoses of gastric-type differentiated adenocarcinoma are often difficult. Mucin immunohistochemistry together with hematoxylin and eosin (HE) staining may be helpful in the pathological diagnosis of this rare disease. |
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Keywords: | Differentiated adenocarcinoma Early gastric cancer Gastrectomy Gastric phenotype Mucin core protein Mucous phenotype |
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