Intraarticular knee ganglion: a case report of an unusual cause of limping in a 4-year-old.

This report describes a 4-year-old boy who presented to the orthopaedic clinic with a primary complaint of limping and refusal to bear full weight on his right leg. An extensive evaluation revealed an intercruciate ganglion cyst of the knee. Diagnostic arthroscopy of the right knee was performed, and the cyst was aspirated and debrided. Magnetic resonance imaging of the knee 3 months and 1 year postoperatively showed a small remnant of the cyst adjacent to the posterior cruciate ligament. At the most recent clinical examination, 13 months postoperatively, the patient was symptom free. To the best of our knowledge, this is the youngest patient in the literature to be diagnosed with an intraarticular knee ganglion.