synovial sarcoma

• soft-tissue mass, usually about 1 cm from joint
• amorphous calcifications (33%)
• most common at knee

• bone erosion (wide zone of transition)
• juxta-articular osteoporosis

Cf: pigmented villonodular synovitis (PVS)

© 2002, C.E. Kahn, Jr.
2002-04-18