32 year old female with anomalous origin of the LPA from aorta pulmonary hypertension and Swyer-James syndrome 
CT in coronal projection shows a hyperlucent anterior segment of the right upper lobe   Note that the “eye of the bull” has become smaller as the anterior segmental airway becomes progressively narrowed                                                                Ashley  Davidoff MD TheCommonVein.net artery-off-aorta-015