Imaging of nail-patella syndrome.

Nail-patella syndrome is a rare disorder, which is inherited as an autosomal dominant trait. This condition is also known as hereditary osteo-onychodysplasia or Fong's syndrome. Posterior iliac horns are commonly found in this syndrome and are considered pathognomonic. In this report, we describe the appearance, location, and structure of iliac horns with respect to radiography and magnetic resonance imaging.