Imaging of synovial chondromatosis with radiologic-pathologic correlation

Area of Science:

• Orthopedics
• Radiology
• Pathology

Background:

• Primary synovial chondromatosis is a rare benign neoplastic condition characterized by hyaline cartilage nodules within subsynovial tissues.
• It commonly affects the knee and hip in adult males, with nodules potentially detaching into the joint space.

Purpose of the Study:

• To highlight the radiologic features of primary synovial chondromatosis.
• To emphasize the importance of radiologic correlation for accurate diagnosis and differentiation from chondrosarcoma.
• To outline current treatment strategies and prognosis.

Main Methods:

• Review of radiologic findings including radiography, computed tomography (CT), and magnetic resonance (MR) imaging.
• Pathologic correlation to distinguish primary from secondary synovial chondromatosis.
• Analysis of treatment outcomes and recurrence rates.

Main Results:

• Radiographs show characteristic intra-articular calcifications in 70%-95% of cases, with extrinsic bone erosion in 20%-50%.
• CT optimally visualizes calcified fragments and bone erosion; MR imaging reveals variable signal intensities reflecting high water content.
• Primary disease is distinguished from secondary by underlying joint pathology and morphology of chondral bodies.

Conclusions:

• Radiologic findings are often pathognomonic for primary synovial chondromatosis, aiding in diagnosis and management.
• Surgical synovectomy with fragment removal is the primary treatment, with recurrence rates between 3% and 23%.
• Malignant transformation to chondrosarcoma is rare but suggested by recurrence and marrow invasion.