<prompt> Notching of ribs occurs in all EXCEPT:Coarctation of aortaNeurofibromatosisHypothyroidismOsteogenesis imperfecta  <response>: ANSWER: C HypothyroidismREF: Chapman page 57CAUSES OF RIB NOTCHINGSuperiorInferior Polio Coarctation of aorta Osteogenesis imperfecta Pulmonary oligemiaA-V malformation Restrictive lung disease Aortic thrombosis Neurofibromatosis Subclavian obstruction Marfans syndrome Taussig blalock operation Connective tissue disorders - RA, scleroderma, SEE Hyperparathyroidism 