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  • Title: Mega os trigonum in progressive pseudorheumatoid dysplasia.
    Author: Oestreich AE.
    Journal: Pediatr Radiol; 2002 Jan; 32(1):46-8. PubMed ID: 11819063.
    Abstract:
    BACKGROUND: Progressive pseudorheumatoid dysplasia (PPRD), a noninflammatory condition, needs to be differentiated diagnostically from juvenile rheumatoid arthritis (JRA). OBJECTIVE: Demonstration of an unusually large and often early-appearing os trigonum helps distinguish PPRD from JRA. MATERIALS AND METHODS: Ankle images in four children with PPRD were reviewed. RESULTS: The os trigonum was abnormally enlarged in all PPRD subjects and was shown to have appeared or fused earlier than normal in two subjects. CONCLUSION: A large and early os trigonum ossification helps differentiate PPRD from JRA.
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