Woman Complains of Knee Pain Following Fight

ANSWER
The radiograph shows a small calcifi­cation along the medial aspect of the medial collateral ligament. This finding is known as a Pellegrini-Stieda lesion. While it certainly could represent a small avulsion fracture, the lack of joint fluid and soft-tissue swelling makes this diagnosis less likely. The patient was treated symptomatically with anti-inflammatory medications.