Posterior iliac horns are seen in –: (A) Fisher's syndrome, (B) Crouzan syndrome, (C) Nail patella syndrome, (D) Pierre Robbins syndrome
Answer is C. Nail-Patella syndrome is characterized by : 

Small or absent nails                  
Overextension of joints  
Small or absent patella    
Posterior iliac horns  
Renal anomalies 
Skin laxity
Hyperhidrosis