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Metallosis and metal-induced synovitis are well-recognized complications of metal-backed polyethylene joint prostheses and have been frequently described in the orthopedic surgery literature; however, relatively fewer articles discussing the radiologic aspects of this complication have been published. To illustrate the importance of radiologic findings in the diagnosis and management of these patients, we present a case of metallosis and metal-induced synovitis complicating two revisions of a total knee arthroplasty, caused by polyethylene liner wear and dissociation of the polyethylene liner from the metal-backed patellar prosthesis. Specific attention is given to reviewing signs that aid in diagnosis, such as the "bubble sign," "cloud sign," and "metal-line signs."

Fibroepithelial polyps represent the most common benign ureteral neoplasms. They are an infrequent cause of urinary tract obstruction and patients can present with ipsilateral flank pain with or without hematuria. We report a case of bilateral fibroepithelial polyps causing ureteropelvic junction obstruction in a child.