Abstract
A 35-year-old woman admitted to our hospital was suspected of having a submcosal tumor in the posterior wall of the cardia after upper gastrointestinal radiography in a medical checkup. Abdominal ultrasonography, computed tomography (CT), and magnetic resonance imaging (MRI) showed a unilocular cyst 5 cm indiameter adjacent to the cardia. She was preoperatively diagnosed with gastric duplication bsaed on endoscopic ultrasonography and 99mTc scintigraphy. Operative findings at laparotomy showed the tumor astrideboth the esophagus and stomach, sharing a common wall at 2×1.5cm. Tumor enuclation was conducted, based on a diagnosis of gastric duplication without malignancy in the rapid intraoperative frozen section diagnosis. The postoperative course was uneventful. CEA and CA19-9 in cyst fluid were quite high, but cytologyof the fluid was in Class I. Histopathologically, mimic mucosa to stomach, ciliated columnar epithelium, andsmooth musclar layer were observed in the inner wall of the cyst. These findings suggest the cyst arose fromthe primitive foregut.
