MR imaging findings in perineal nodular induration ("cyclist´s nodule"): A case report

Perineal nodular induration (PNI) is a rare condition related to sports linked to the use of a saddle, mostly cycling, thought to be caused by the compression of the soft tissue between the saddle and the ischial tuberosity. We report a case of a 59-year-old amateur cyclist male who presented with 2 bilateral nodular perineal lesions that were evaluated with ultrasound and magnetic resonance imaging (MRI). MRI findings, along with the history of a strong cycling habit, led to the diagnosis of PNI, and a conservative management was adopted. MRI features of PNI are characteristic, and may provide the diagnosis in the proper clinical setting.