USMLE STEP 3 MCQ 14 : What is the most likely diagnosis?



a) Ventricular septal defect
b) Patent ductus arteriosus
c) Coarctation of aorta
d) Supravalvular aortic stenosis
e) Pulmonary valve stenosis


Correct Answer: C


PA chest radiograph demonstrates rib notching/erosion of ribs 5-8 bilaterally (secondary to intercostal collateral development). There is cardiomegaly, figure-three sign in the left upper mediastinum and post-stenotic dilation of the descending aorta


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