Nail-Patella Syndrome

Nail-patella syndrome (synonyms: Fong’s disease, Trauner-Rieger syndrome) is a rare autosomal dominant condition.
Clinically the key feature is absent/hypoplastic nails from birth.
• Diagnostic radiographic findings include the following:
o Absent/Hypoplastic patellae (with a tendency to recurrent dislocation)
o Hypoplasia of the radial head or capitellum (leading to subluxation/dislocation)
o 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.
References:
1. Carty et al, Imaging Children p441-2
2. Anna Choczaj-Kukula, Nail-Patella Syndrome EMedicine
3. Dähnert W. Radiology Review Manual 5th edition. Lippincott, Williams & Wilkins 2003
Credit: Dr Ian Bickle, Dr Smitha Vandiyil
http://www.radpod.org