Osteochondromatosis is a condition in which multiple benign, cartilage-capped tumors arise from the surface of bones formed by endochondral ossification. The current report describes the presence of 4 prominent exophytic masses, measuring between 4 and 13 cm in diameter, arising from the surface of the ribs, and located within the thoracic cavity, in a 2-year-old female domestic pig (Sus scrofa...

cutaneous metaplastic synovial cyst (cmsc), presents as a solitary, tender subcutaneous nodule that usually occurs at the site of previous surgery or trauma. histologically, the lesion is characterized by a cystic structure with villous-like projections that lined by metaplastic synovial tissue. the main cause remains unclear, but trauma is presumed to be a precipitating factor, as most reporte...

A 38-year-old woman presented with a very large synovial chondromatosis arising from the interphalangeal joint of the thumb. The tumor surrounded the interphalangeal joint and its size was approximately 3 cm. The range of motion was almost fused. Plain radiographs showed an extra-osseous tumor shadow with calcifications. The patient had no local recurrence at one year of follow-up after margina...

CASE SUMMARY A 13-year-old domestic shorthair cat presented for evaluation of pain and difficulty ambulating. Orthopedic examination and CT facilitated a diagnosis of bilateral elbow synovial osteochondromatosis with medial humeral epicondylitis and concurrent osteoarthritis. Right humeroradial subluxation was evident on CT images, but no instability was evident preoperatively. Surgical treatme...