This lecture provides an overview of the variety of bone and soft-tissue tumours and tumour-like lesions that may present clinically as monoarthropathy, ie; a swollen painful joint. Bone tumours include osteoid osteoma and chondroblastoma, which can produce a florid reactive synovitis. The most common soft tissue neoplasms are pigmented villonodular synovitis (PVNS), synovial osteochondromatosis (SOC), synovial haemangioma and lipoma arborescens, while non-neoplastic lesions include reactive synovitis and septic arthritis (including TB). The knee joint is by far the most common location, and most lesions present in adulthood. Malignant intra-articular soft tissue tumours are extremely rare.

Educational aims:
• To raise awareness of the possibility of neoplastic causes of monoarthropathy
• To indicate the most common pathologies and joints involved
• To illustrate the imaging features of the various lesions

References:
• Sheldon PJ1, Forrester DM, Learch TJ. Imaging of intraarticular masses. Radiographics 2005 Jan-Feb; 25:105-19.
• Garner HW1, Bestic JM. Benign synovial tumors and proliferative processes. Semin Musculoskelet Radiol 2013;17: 177-88.

0.5 CPD credit

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