Carina crossover sign

Last revised by Ayla Al Kabbani on 14 Nov 2019

The carina crossover sign is a morphological sign that describes the right pulmonary artery crossing the carina midline anteriorly i.e. cranially to its expected course. It is a highly specific criterion for the diagnosis of pulmonary arterial hypertension (PAH) on axial CT/MRI and together with an enlarged pulmonary trunk results in 100% specificity and positive predictive value. 

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