Pulmonary nodule Perifissural pulmonary nodule 2021-01-30T22:28:48Z Solid, homogenous nodules characterized by a smooth margin and oval, rounded, lentiform or triangular shape. They are typically located within 15 mm from the issue or the pleura. Perifissural nodules may be further differentiated into typical (have contact with interlobar septum) and atypical (do not have contact with interlobar septum). They likely represent intrapulmonary lymphnodes.