A pure uterine lipoma: a rare, benign entity

A 71-year-old woman presented with a history of left loin pain and where renal calculi were clinically suspected. As part of her initial investigations, she had an ultrasound and an unenhanced CT of her abdomen. Within the body of the uterus, there was a 2.5 cm well demarcated, hyperechoic mass. The CT demonstrated a well-defined, round lesion within the uterus, of fat attenuation. The overall appearances were in keeping with a benign uterine lipoma. Uterine lipomas are rare, benign tumours that are part of a spectrum of uterine fatty tumours. Although they have characteristic imaging findings, they can be misdiagnosed and confused with more sinister neoplasms. The authors present a case of a pure uterine lipoma and discuss the imaging features on ultrasound, CT and MRI. The authors hope that highlighting the radiological characteristics of this benign entity will aid confident diagnosis and avoid unnecessary investigations or surgery in this patient population.