From the case:
Nail-patella syndrome
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Cropped view of the left side of the pelvis demonstrates a triangular bony opacity consistent with a posterior iliac horn.
Case Discussion
Nail-patella syndrome (synonyms: Fong’s disease, Trauner-Rieger syndrome) is a rare autosomal dominant condition.
Clinically the key features are congenitally absent/hypoplastic nails and patellae.
Diagnostic radiographic findings include the following:
- absent/hypoplastic patellae (with a tendency to recurrent dislocation)
- hypoplasia of the radial head or capitellum (leading to subluxation/dislocation)
- bilateral posterior iliac horns.
- the bilateral posterior iliac horns are due to exostoses arising from the posterior aspect of the iliac bones are present in as many as 80% of patients; this finding is considered pathognomonic for the syndrome