<prompt> Bilateral rib notching is seen in -Coarctation of aoaPDATAPVCAll of the above  <response>: The differentials differ according to whether it is the superior or inferior surface that is notched. Superior rib notching abnormal osteoblastic activity o osteogenesis imperfecta o connective tissue diseases SS rheumatoid ahritis SS systemic lupus erythematosus SLE SS Marfan syndrome SS Sjogrens syndrome SS scleroderma o local pressure abnormal osteoclastic activity o hyperparathyroidism miscellaneous o neurofibromatosis type 1 o restrictive lung disease o poliomyelitis o progeria o abnormal muscle pull Inferior rib notching Roesler sign enlarged collateral vessels o coarctation of the aoa o interrupted aoic arch o subclan aery obstruction SS Takayasu disease SS Blalock-Taussig shunt: involves only upper two rib spaces o aeriovenous malformation AVM of the chest wall o superior vena cava obstruction with enlarged venous collaterals o pulmonary AVM o tetralogy of Fallot neurogenic tumors o schwannoma usually single o neurofibromatosis type 1 rarely can be superior if neurofibroma is very large Superior and inferior rib notching hyperparathyroidism neurofibromatosis type 1 