Suspicious nodule with features atypical for PAVM

Contrast-enhanced computed tomography of the chest (serial consecutive cuts shown) showing a 1 cm moderately-enhancing nodule (rings) with a small feeding artery (arrow) and no draining vein. Subsequent pulmonary angiography revealed no PAVM. This CT displays some of the atypical features associated with PAVM including only one tubular structure leading into the sac and irregular sac borders. Other potential atypical features include irregular or no contrast enhancement and tubular structures that don't blend with the sac but continue past the nodule/sac (not shown).