Polygonal Nodule

**Semantic type:** Finding

**Definition:** A nodule shape that is a two dimensional with 3 or more straight sides that do not cross and is a closed shape. Examples of polygons would include triangles, squares, rectangles, hexagons, and octagons. Polygonal nodules are commonly delimited by interlobular septal margins and are a feature of intrapulmonary lymph nodes or possibly bronchiolar/arteriolar disease.

**Synonyms:** - Polygonal