胃重复是一种罕见的先天性异常疾病,约占重复消化道畸形的4%,通常于出生前或婴儿时诊断。成人腹膜后胃重复病例文献报道极为罕见,多无症状或症状无特异性,影像学检查特异性差,易误诊为其他腹膜后囊性病变。腹膜后胃重复可通过腹部增强CT、胃内超声及超声引导细针活检等检查的典型表现明确诊断。北京大学人民医院于2019年3月收治1例外院CT提示腹膜后囊性病变的成年女性患者,术前北京大学人民医院腹部增强CT提示左肾上方囊性灶,最大截面9.0 cm×5.2 cm,需要鉴别淋巴囊肿及其他,病灶考虑来源胃可能大。术前未明确腹膜后胃重复诊断,用腹腔镜经腹腔探查见囊性病变位于腹膜后,胰腺、左侧肾及肾上腺受压可完全分离,囊性病变顶部与胃小弯相连但与胃腔内不通,成功完整切除腹膜后囊性病变,周围脏器无损伤,经术后病理结合术中所见明确诊断腹膜后胃重复。患者术后1周出院,无胃肠道损伤,饮食排便正常,因此腹膜后囊性病变鉴别诊断应考虑到腹膜后胃重复可能,当CT可见典型表现或肿物与胃壁分界不清时,可进一步行胃内超声及超声引导下细针活检明确诊断。明确诊断或怀疑腹膜后胃重复的患者,可行腹腔镜经腹腔途径完整切除腹膜后胃重复囊肿,并彻底修复胃壁。

Gastric duplication is a rare congenital anomaly accounting to 4% of all gastrointestinal tract duplications. It is usually diagnosed pre-natally or during infancy. Retroperitoneal gastric duplication is very rare in adult patients. It is generally asymptomatic or presents with non-specific symptoms. The sensitivity of classical imaging modalities for retroperitoneal gastric duplication is weak. Retroperitoneal gastric duplication could be misdiagnosed as other retroperitoneal cystic lesions and it could be definitely diagnosed by typical findings of abdominal enhanced computed tomography (CT) and endoscopic ultrasonography (EUS) plus EUS:guided fine needle aspiration biopsy in gastric duplicated cyst. A female adult patient was diagnosed by an exceptional hospital CT as retroperitoneal cystic lesion and was admitted in our hospital in March 2019. The abdominal enhanced CT in our hospital preoperatively indicated a cystic lesion above the left kidney and the maximum cross section was 9.0 cm ×5.2 cm. Lymphocysts and others should be identified and the lesion might be from the stomach. The retroperitoneal gastric duplication was not diagnosed before operation. In the operation laparoscopy revealed the cystic lesion in the retroperitoneum. The pancreas, left adrenal gland, and left kidney were compressed by the cystic lesion. The top of the lesion was connected with the small curvature of the stomach, but it was not communicated with the stomach. The retroperitoneal cystic lesion was completely excised and the surrounding organs were not damaged. The retroperitoneal gastric duplication was clearly diagnosed by the findings in the operation and the pathology of the lesion. The patient was discharged a week after surgery without gastrointestinal and pancreatic injuries. Therefore, the differential diagnosis of retroperitoneal cysts should consider the possibility of retroperitoneal gastric duplication. For patients with typical CT findings or unclear boundaries between the tumor and the stomach wall, gastric duplication could be diagnosed by EUS plus EUS:guided fine needle aspiration biopsy in the cyst. Retroperitoneal gastric duplication cyst could be completely excised by laparoscopy through abdominal cavity and the stomach wall could be completely repaired.