II. Definitions

  1. Synovial Sarcoma
    1. Slow growing, malignant lesion originating in the joints and synovial cells of tendons and bones
    2. Most often affects the legs (but can also involve abdominal wall and other torso Muscles)

III. Epidemiology

  1. Peak onset age 30 to 40 years old

IV. Findings

  1. Slow growing lesion, typically on the legs or trunk, from 3 to 10 cm in diameter

V. Imaging

  1. XRay
    1. Calcifications may be present (33% of cases)
    2. Bony erosions in up to 20% of cases
  2. Ultrasound
    1. Heterogeneous mass with interspersed necrosis
  3. MRI
    1. Well demarcated mass with similar isointensity to Muscle on T1

VI. Management

  1. Refer for core needle biopsy and surgical resection

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