Juxta-articular soft-tissue mass

A myxoma (New Latin from Greek 'muxa' for mucus) is a myxoid tumor of primitive connective tissue. It is most commonly found in the heart (and is the most common primary tumor of the heart in adults) but can also occur in other locations. [Source: Wikipedia ]

May Be Caused by

Common: Abscess; Aneurysm; Arteriovenous fistulas; Baker cyst; Bunion; Bursal fluid collection; Bursitis; Calcific tendonitis; Ganglion; Gouty tophus; Hemarthrosis; Joint effusion; Myositis ossificans; Neuropathic arthropathy; Osteoarthritis; Periarticular calcification; Synovial cyst; Synovial hypertrophy secondary to arthritis; Synovial osteochondromatosis
Uncommon: Amyloidosis; Articular chondroma; Calcium pyrophosphate dihydrate crystal deposition disease; Giant cell tumor of tendon sheath; Hydatid disease; Juxtaarticular myxoma; Lipoma; Lipoma arborescens; Localized nodular synovitis; Meniscal cyst; Multicentric reticulohistiocytosis; Neuroma; Para-articular chondroma; Parosteal chondrosarcoma; Parosteal osteosarcoma; Perilabral cyst; Pigmented villonodular synovitis; Synovial hemangioma; Synovial sarcoma; Tumoral calcinosis; Xanthoma