摘要To the Editor:A 46-year old woman (gravida 3,para 1) presented at West China Second Hospital with complaints of a space-occupying lesion in the uterus that,2 years before,had been diagnosed as a uterine cyst at West China Second Hospital.On that previous occasion,B-ultrasonography revealed a cystic mass with a compartmentalized structure (10.3 × 5.4 × 8.8 cm) on the left side of the pelvic cavity,and laparoscopic exploration found a cystic mass on the posterior uterine wall,which was diagnosed as "leiomyoma with cystic degeneration" based on pathology analysis of flash-frozen surgical tissues.Laparoscopic "myomectomy" was performed,and pathology analysis of paraffin-embedded tissue confirmed "leiomyoma with degeneration." Immunohistochemistry showed the lesion to be positive for caldesmon but negative for CD10.Rate of Ki67 positivity was less than 1％,indicating a benign lesion.The woman recovered well after the operation.Follow-up ultrasonography at 3 months after surgery identified a uterine cystic mass of 3.0 × 2.5 × 1.7 cm.