Primary lipoma arborescens of the knee

Abstract

Lipoma arborescens is a rare and benign intra-articular lesion of unknown etiology; it is characterized by synovial villous proliferation and sub-synovial connective tissue replacement by mature fatty tissue. It is part of the differential diagnosis in patients with an articulation affected by a slow, progressive, and chronically inflamed affection. We report primary knee involvement in a patient without significant articulate antecedents. Lipoma arborescens was diagnosed after knee magnetic resonance imaging and was confirmed by an anatomopathological study of the surgical specimen.

Intra-articular Lipoma of the Knee Joint Located in the Lateral Recess: A Case Report

“…Although they may arise almost anywhere there is fatty tissue in the body, intra-articular examples are extremely rare. Only dozens of cases have been reported so far [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Most cases occur in the knee joint.…”

“…Most cases occur in the knee joint. There are two different benign types of lipoma: The true lipoma and the more common lipoma arborescens [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ].…”

“…The clinical findings of intra-articular lipoma depend on the site and size of the mass. Most of the patients may be asymptomatic and some have complaints of dull pain or discomfort due to pressure, joint swelling, motion pain, and limitation of the range of motion [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ].…”

“…There are two types of lipomas, true lipoma and lipoma arborescens. Basically, intra-articular true lipoma is so rare, with only dozens of cases reported in the literature up to now [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Clinically, most of the patients with intra-articular lipoma are asymptomatic, some show as pressure symptoms caused by mass lesions, such as locking, kneeling pain, and so on.…”

Bilateral Lipoma Arborescens of the Knee in an Adolescent Patient

“…재발은 매우 드문 것으로 알려져 있다. 3)감별해야 할 병변으로 진행성 융모결절성 활액막염, 활액막 지 방종, 활액막 혈관종, 활액막 연골종 등이 있으며,3,10) 청소년기 환 자에서 양측 슬관절에 부종과 통증의 증상이 있을 때에는 소아성…”