Magnetic resonance imaging was done for the mother to exactly delineate the iliac horns and their anatomical relationship with surrounding structures.
MRI clearly revealed cortical and medullar components of the iliac horns, and their continuity with the corresponding posterolateral aspect of iliac bones.
Although the diagnosis of nail patella syndrome can be established in early infancy through the radiographic demonstration of iliac horns, this disorder is rarely diagnosed in infancy.
Pathognomic radiological features of iliac horns are present in 30-70% of patients.
If the diagnosis of NPS is indicated, the presence of the iliac horns can confirm this syndrome.
Bilateral accessory iliac horns: pathognomonic findings in Nailpatella syndrome.
Renal dysplasia in a family with multiple hereditary abnormalities including iliac horns. Lancet 1950; 1: 803.
Fig 1b: AP radiograph of pelvis with both hips showing iliac horns.
RADIOLOGIC DIAGNOSIS: Bilateral patellar hypoplasia with bilateral iliac horns consistent with Nail Patella Syndrome.
(1) It was first described by Little (2,8) in 1897 as characterized by hypoplastic or absent patellae, dystrophic nails, elbow dysplasia, and iliac horns. For the past 50 years, great insight has been provided into the molecular origins of this syndrome.
The iliac horns are pathognomonic for NPS and can be palpable by physical examination, but they do not cause symptoms or gait disturbances.
(7.) Hawkins CF, Smith OE (1950) Renal dysplasia in a family with multiple hereditary abnormalities including iliac horns. Lancet: 803-808.