Lipoma arborescens of the bicipitoradial bursa

Abstract

Lipoma arborescens (LA) is a rare, benign articular lesion that is most commonly found within the suprapatellar recess of the knee. An extremely rare case of LA involving unilateral bicipitoradial bursa is described in this study. A 58-year-old male presented with a superficial soft mass on the volar aspect of the left forearm. The magnetic resonance imaging (MRI) examination demonstrated a lobulated complex mass containing multiple frond-like fatty nodules, along the distal biceps tendon in the bicipitoradial bursa. Ultrasound-guided biopsy of the lesion confirmed the diagnosis of LA and patient was scheduled for surgical excision. Recognizing the characteristic imaging of LA, particularly on MRI, is essential for accurate pre-procedural diagnosis.

Femoral osteochondroma responsible for ischiofemoral impingement, bursitis, and secondary lipoma arborescens mimicking malignant transformation

“…The disease is monoarticular in most cases but involvement of several joints in the same patient has been described (36,38,39). Extra-/peri-articular location of LA, especially in bursae, such as in the sub acromial space or prepatellar bursa, has been more exceptionally reported (8,9,36,37,40). In some cases, LA may be associated with osteochondral loose bodies (41).…”

“…It may be observed in association with chronic joint irritation and effusion of various origins. Rare observations were made within chronic bursitis (8,9). Its observation in the case of bursitis outside of an articulation supports the hypothesis of chronic inflammation inducing synovial hypertrophy and subsequent adipose differentiation (10).…”

The blubbery protrusions: Lipoma arborescens

“…Nod-ules of synovial chondromatosis may calcify. Synovial osteochondromatosis displays dispersion of typical cartilaginous or ossi ied loose bodies within the swollen joint [6,7].…”

“…Minimal signal intensity is detected upon T2 weighted imaging. Adipose tissue signal is absent [6,7].…”

“…Radiographic absence of bony erosion and sclerosis, irm consistency of periarticular soft tissue mass as discerned upon ultrasonography, enhanced density of internal contents, lack of erosion of articular surfaces upon computerized tomography (CT) and the absence of haemorrhagic elements or susceptibility signal upon magnetic resonance (MR) imaging eliminate the presence of pigmented villonodular synovitis [7,8].…”