What are the main differential diagnosis for unilateraly protrusio acetabuli ?
Tuberculous arthritis, Trauma, Fibrous dysplasia.
What are the main differential diagnosis for bilateral protrusio acetabuli ?
Rheumatoid arthritis, Paget disease, Osteomalacia.
Intrapelvic displacement of the medial wall of the acetabulum is seen with triangular shaped pelvis on axial images. Generalized bone loss and large staghorn stone at right kidney is noted.