Perifissural nodules

The CT-equivalent term, perifissural nodule, has come to refer to a noncalcified solid nodule with sharp margins and a regular shape abutting or near the pleural or fissural margin. Unfortunately, as the authors note, the term perifissural nodule is imprecise and somewhat misleading, in part due to the lack of uniformity of its definition.

URL: https://pubs.rsna.org/doi/epdf/10.1148/ryct.2020200409

CT Perifissural lung nodules are typically seen as well-circumscribed, smoothly marginated homogeneous nodules in contact with or closely related to a pulmonary fissure. Most show a triangular, oval/lentiform, rectangular, or dumbbell shape. They may often show a septal attachment to the pleural surface.

URL: https://radiopaedia.org/articles/perifissural-lung-nodules