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Updated: Apr 5, 2026

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Published on: January 2, 2026
Synovial Sarcoma-AV Malformation Collision in the Anterior Mediastinum
Abstract:
Arteriovenous malformation (AVM) and synovial sarcomas are both rare lesions in the mediastinum. Rarer still is a collision tumor in that region. Herein we present a case of a collision tumor comprised of AVM and synovial sarcoma in a 76-year-old man, presenting with pneumonia. Imaging showed a vascular lesion that spontaneously ruptured, causing enlargement of the mass and hemothorax. The resected specimen revealed the malignant second component. This report is a discussion of the never-before reported lesion.
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