A case of juxta-articular myxoma of the knee

✍ Scribed by Aaron Daluiski; Leanne L. Seeger; Susan A. Doberneck; Gerald A. M. Finerman; Jeffrey J. Eckardt

• Book ID: 104659490
• Publisher: Springer
• Year: 1995
• Tongue: English
• Weight: 754 KB
• Volume: 24
• Category: Article
• ISSN: 0364-2348
• DOI: 10.1007/bf00197076

✦ Synopsis

Clinical information

The patient is a 9-year-old girl who complained of progressive pain in the right knee over the course of several weeks. The pain was located posteriorly and worsened with extreme knee flexion. Plain radiographs were normal. She had no history of trauma and denied locking or popping of her knee. After completing a 1-month course of physical therapy, the patient underwent magnetic resonance imaging (MRI) of the affected knee (Fig. 1). This study showed a well-defined mass measuring 2.5x2.0x2.0 cm in the posterolateral knee joint. The mass directly abutted and displaced the posterior horn of the lateral meniscus, but the meniscus was otherwise normal. The lesion was isointense to muscle on T1weighted images and of inhomogeneous intermediate signal intensity on T2-weighted images.

Despite the fact that the patient's pain markedly decreased over the ensuing 5 months, further consultation was sought for evaluation of the mass. At this time, examination of the right knee revealed a posterolateral palpable mass and mildly reduced flexion. The physical examination was otherwise unremarkable. There was no associated edema, erythema, or joint effusion, and there