"Some publications suggest that lymph nodes may account for 24–44% of non-calcified nodules in a lung cancer screening setting 7 and may represent up to 66% of all nodules on CT scans. They are commonly seen in the mid and lower zones and can be difficult to differentiate from malignant pulmonary nodules with certainty. Nodules superior to the carina are less likely to be lymph nodes and more likely to be primary lung cancers."
"The term intrapulmonary lymph node excludes mediastinal, hilar and peribronchial lymph nodes. The latter occur at bronchial bifurcations up to and including the third branch."
"lymph nodes located at the junction of interlobular septa may show a discrete thin line extending to the pleura which may be due to interlobular septum, venule or lymphatics"
"indistinct or irregular margin, spiculation or microlobulation"
"lenticular, ovoid, semicircular, triangular, trapezoidal, polygonal, faceted"