Intra-articular Lipoma in Posterior Compartment of Knee Joint: A Case Report

Abstract

Lipomas are the most common benign soft tissue tumors, occurring in almost any part of the body and prevalent in 2% of the population. The occurrence of intra-articular lipoma is rare and mostly documented in the anterior compartment of the knee joint, like the Hoffman pad of fat and suprapatellar region. The incidence of intra-articular lipoma in the posterior compartment of the knee joint is very rare. Herein, the authors presented a case report of a 21-year-old female with a history of chronic intermittent left knee joint pain for the last two years. Magnetic Resonance Imaging (MRI) revealed a well-defined, encapsulated lesion that was hyperintense on T1/ T2 images and hypointense on, located in the intercondylar notch, anterior to the proximal half of the posterior cruciate ligament, and closely abutting the ligament. Computed Tomography (CT) showed a fat density lesion (-82 to -93 HU), indicating a lipomatous lesion. The patient underwent laparoscopic removal of this lesion, and histopathology confirmed the fatty nature of the lesion.

Keywords

• chronic knee pain
• magnetic resonance imaging of knee joint
• soft tissue tumors