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Related Experiment Videos

Synovial sarcoma with extensive osteoid and bone formation

S Milchgrub1, L Ghandur-Mnaymneh, H D Dorfman

  • 1Department of Pathology, University of Texas Southwestern Medical Center, Dallas 75235-9072.

The American Journal of Surgical Pathology
|April 1, 1993
PubMed
Summary

Synovial sarcoma can present with extensive bone formation, mimicking osteosarcoma on imaging. Accurate diagnosis is crucial for appropriate treatment and patient outcomes.

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Area of Science:

  • Orthopedic Pathology
  • Skeletal Radiology
  • Soft Tissue Tumors

Background:

  • Synovial sarcoma is a malignant soft tissue tumor.
  • This study focuses on a rare variant with extensive calcification and bone formation.

Observation:

  • Four cases of synovial sarcoma with significant ossification are presented.
  • Radiological features often suggested benign lesions or osteosarcoma.
  • Tumor locations included the foot and thigh.

Findings:

  • Histologically, tumors showed amorphous calcifications and extensive osteoid deposition.
  • This ossification can lead to misdiagnosis as osteosarcoma.
  • Biphasic pattern, though key, may not be evident in small biopsies.

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Implications:

  • Recognizing this ossifying variant of synovial sarcoma is vital to differentiate it from extraskeletal osteosarcoma.
  • Accurate diagnosis impacts clinical management and prognosis.
  • Immunohistochemistry for cytokeratin and epithelial membrane antigen aids in diagnosis.