RESUMEN
Objective:To discuss the value of ultrasound in the diagnosis of pelvic lipomatosis and analyze the causes of misdiagnosis.Methods:A retrospective analysis of 68 cases of pelvic lipomatosis confirmed by operation or imaging in Peking Union Medical College Hospital from January 2000 to December 2018 was made to summarize the characteristics of ultrasonic manifestations.Results:Ultrasonographic findings were as follows: 6 cases (8.8%) had increased fat-like hyperecho in pelvic cavity; 60 cases (88.2%) had abnormal bladder; 42 cases (61.7%) had pyelectasis and 24 cases (35.3%) had ureterectasis. Of the 68 cases, 6 cases (8.8%) were correctly diagnosed; 54 cases (79.4%) were missed; 8 cases (11.8%) were misdiagnosed, including 7 cases (10.3%) of bladder tumor and 1 case (1.5%) of retroperitoneal giant mass.Conclusions:Pelvic lipomatosis has characteristic sonographic features.When urinary tract obstruction and bladder wall thickening are observed, pelvic lipomatosis should be considered. Bladder shape and existence of increasing fat-like hyperecho in the pelvis should be further scanned to reduce the misdiagnosis rate of pelvic lipomatosis.