Multimodality Imaging Findings of Primary Embryonal Rhabdomyosarcoma in the Prostate: A Rare Case Report.

Embryonal rhabdomyosarcoma (ERMS) of the prostate is an extremely rare malignant tumor, which often presents with urinary symptoms. We report a 32-year-old male with recurrent urinary retention diagnosed with prostatic ERMS via surgical pathology. This case analyzes the reasons for initial misdiagnosis and details multimodal imaging features on ultrasound (US), contrast-enhanced ultrasound (CEUS), CT, and MRI. Notably, this report provides the first description of the CEUS enhancement pattern in prostatic ERMS, which may represent a unique imaging characteristic.