Figure 1.

CT angiography of the abdominal aorta. (A) Coronal imaging revealed a low-density cystic mass with a Hounsfield units value of 30 on the left front of the T12-L2. The size of the cyst was determined to be ~3x4x6 cm. The lower part of the cyst is adjacent to the left renal artery and the medial part is adjacent to the abdominal aorta. (B) Upper cross-sectional imaging indicated that the cyst slightly compressed the abdominal aorta and originated from the left diaphragmatic crus, with the upper part located in the retrocrural space. (C) Middle cross-sectional imaging revealed that the lower part of the cyst extended into the retroperitoneal space. (D) Cross-sectional imaging below indicated that the lower edge of the mass was adjacent to the left renal artery.