The retroperitoneal cystis was 13 patients including of 7 choledochoceles, 2 lymphangisma cyst, 1 cystic teratoma, 3 giant hydronephrosis.

• 腹膜后囊性占位13例，7例胆总管囊肿，2例腹膜后淋巴管瘤，1例囊性畸胎瘤，3例重度肾积水。