Soft-tissue mass with adjacent bone erosion

Common: Abscess; Aneurysm; Carcinoma of skin or mouth; Cellulitis; Decubitus ulcer; Gouty tophus; Rheumatoid arthritis
Uncommon: Actinomycosis; Amyloidosis; Arteriovenous fistulas; Bacillary angiomatosis; Blastomycosis; Bleeding tendency; Carcinoma arising from chronic osteomyelitis; Carcinoma arising from tropical ulcer; Chondroma; Chondrosarcoma; Ewing sarcoma; Fibromatosis; Fibrosarcoma; Ganglion; Giant cell tumor of tendon sheath; Glomus tumor; Hemangioma; Hemophilia; Kaposi sarcoma; Lymph node; Lymphangioma; Malignant fibrous histiocytoma; Meningioma; Morton neuroma; Multicentric infantile myofibromatosis; Multicentric reticulohistiocytosis; Neurofibroma; Neurofibromatosis type 1; Neuroma; Nodular synovitis; Osteosarcoma; Parachordoma; Parosteal sarcoma; Periosteal ganglion; Pigmented villonodular synovitis; Primitive neuroectodermal tumor; Sarcoidosis; Schwannoma; Sebaceous cyst; Sternocostoclavicular hyperostosis; Surfer knot; Synovial osteochondromatosis; Synovial sarcoma; Tumoral calcinosis; Tylosis; Xanthomatosis