Asymptomatic adenocarcinoma arising from a gastric duplication cyst: A case report.
BACKGROUND
Duplication of the alimentary tract is a relatively uncommon congenital anomaly and most cases occur in childhood. Malignancy arising from a gastric duplication cyst is extremely rare. We herein report a very rare case of malignant transformation of a gastric duplication cyst.


METHODS
A 47-year-old asymptomatic Japanese woman was referred to our hospital with a large abdominal mass adhered to the stomach. Since there was a possibility of malignant transformation, complete resection of the cyst and segmental gastrectomy without regional lymphadenectomy were performed.


CONCLUSIONS
To our knowledge, this is the 2nd report of asymptomatic adenocarcinoma arising from a gastric duplication cyst in the English-language literature. Unfortunately, the patient developed peritoneal metastasis and ascites seven months after the surgery and died.


CONCLUSIONS
From our long-term follow-up experience of this gastric duplication cyst, we recommend making accurate diagnosis as soon as possible with biopsy using endoscopic ultrasonography. When the disease is diagnosed as malignant, we recommend gastrectomy with lymphadenectomy. Even if the disease is diagnosed as benign, we recommend close observation with imaging modalities.
Department of Cancer Therapy and Research, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan; Department of Surgery, Japanese Red Cross Fukuoka Hospital, Fukuoka 815-8555, Japan. Electronic address: y-akio@surg1.med.kyushu-u.ac.jp.
Akio
A
Yamasaki
Department of Cancer Therapy and Research, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan.
Hideya
H
Onishi
Department of Surgery, Japanese Red Cross Fukuoka Hospital, Fukuoka 815-8555, Japan.
Hirofumi
H
Yamamoto
Department of Surgery, Japanese Red Cross Fukuoka Hospital, Fukuoka 815-8555, Japan.
Jun
J
Ienaga
Department of Surgery, Japanese Red Cross Fukuoka Hospital, Fukuoka 815-8555, Japan.
Yuji
Y
Nakafusa
Department of Surgery, Japanese Red Cross Fukuoka Hospital, Fukuoka 815-8555, Japan.
Reiji
R
Terasaka
Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan.
Masafumi
M
Nakamura
Adenocarcinoma; Case report; Gastric duplication cyst; Malignant transformation