Cervical rib (A) causing subclavian arterial thrombosis (A, B) and cerebellar (C) and cerebral infarctions (D). Computed tomography angiography with surface rendering demonstrates a cervical rib (A black arrow) causing subclavian arterial thrombosis on the right side. The right clavicle has been subtracted from the image. Reformation with maximum intensity projection of the same volume. The right subclavian artery (B asterisk) is occluded proximal to the thoracic outlet and refilled with contrast by collateral vessels before entering the axilla (white arrow). Diffusion imaging (B1000) reveals punctuate foci of acute infarctions in the right cerebellum in C and posterior right frontal lobe in D (white arrows).