Primary gastric malignant melanoma: challenge in preoperative diagnosis.
Primary gastric melanoma is an extremely rare clinical entity. The clinical manifestation is not specific and usually similar with other common malignancies at this site, such as gastric cancer and lymphoma. And there are no specific radiological features either. Preoperative diagnosis via biopsy is usually difficult, since melanoma pigment could be absent in the biopsy tissue. Here, we report a case of a 50-year-old woman with a mass in the stomach found by gastroscopy. Biopsy was taken twice preoperatively under gastroscope and it was diagnosed as gastric carcinoma and neuroendocrine tumor respectively. Radical surgery was performed with gastrectomy and D2 lymph node dissection. Postoperative pathological examination finally made a definite diagnosis of gastric melanoma by immunohistochemistry. We summarize the reasons for preoperative misdiagnosis and discuss the difficulty in diagnosing gastric melanoma according to literature.
Department of Gastrointestinal Surgery, The First Affiliated Hospital, Sun Yat-Sen University 58 Zhongshan 2nd Road, Guangzhou 510080, China.
Wu
W
Song
Department of Gastrointestinal Surgery, The First Affiliated Hospital, Sun Yat-Sen University 58 Zhongshan 2nd Road, Guangzhou 510080, China.
Fakeng
F
Liu
Department of Gastrointestinal Surgery, The First Affiliated Hospital, Sun Yat-Sen University 58 Zhongshan 2nd Road, Guangzhou 510080, China.
Shaochuan
S
Wang
Department of Pathology,The First Affiliated Hospital, Sun Yat-Sen University Guangzhou, China.
Huijuan
H
Shi
Department of Gastrointestinal Surgery, The First Affiliated Hospital, Sun Yat-Sen University 58 Zhongshan 2nd Road, Guangzhou 510080, China.
Weiling
W
He
Department of Gastrointestinal Surgery, The First Affiliated Hospital, Sun Yat-Sen University 58 Zhongshan 2nd Road, Guangzhou 510080, China.
Yulong
Y
He
D014408:Biomarkers, Tumor / Q000032:analysis; D001706:Biopsy; D002277:Carcinoma / Q000737:chemistry / Q000473:pathology; D003951:Diagnostic Errors; D005260:Female; D005743:Gastrectomy; D005773:Gastroscopy; D006801:Humans; D007150:Immunohistochemistry; D008197:Lymph Node Excision; D008545:Melanoma / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D008875:Middle Aged; D018358:Neuroendocrine Tumors / Q000737:chemistry / Q000473:pathology*; D011237:Predictive Value of Tests; D013274:Stomach Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000601:surgery; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
D014408:Biomarkers, Tumor
Primary gastric malignant melanoma; extracutaneous melanoma; preoperative diagnosis