Please select the type of atypical pulmonary cyst:

Thick-walled cyst with growing size, but not growing wall thickness or nodularity.  

Thick-walled cyst, new or at baseline OR Multilocular cyst at baseline OR Thin-or thick-walled cyst that becomes multilocular.    

Thick-walled cyst with growing wall thickness/nodularity OR Growing multilocular cyst(mean diameter) OR Multilocular cyst with increased loculation or new/increased opacity(nodular, ground glass, or consolidation).

The nodule has been stable for 3 months(previous category 4A) or 6 months (previous category 3) or had benign following workup (previous category 4B) since the prior study.

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Note:

Thin-walled Cyst: Unilocular with uniform wall thickness < 2 mm. Thin-walled cysts are considered benign and are not classified or managed in Lung-RADS.
Thick-walled Cyst: Unilocular with uniform wall thickness, asymmetric wall thickening, or nodular wall thickening ≥ 2 mm (cystic component is the dominant feature); manage as an atypical pulmonary cyst.
Multilocular Cyst: Thick or thin-walled cyst with internal septations. Manage as an atypical pulmonary cyst.
Cavitary Nodule: Wall thickening is the dominant feature; manage as a solid nodule (total mean diameter).
Cyst with an Associated Nodule: Any cyst with adjacent internal (endophytic) or external (exophytic) nodule (solid, part-solid, or ground glass). Management is based upon Lung-RADS criteria for the most concerning feature.
Growth: > 1.5 mm increase in nodule size (mean diameter), wall thickness, and/or size of the cystic component (mean diameter) occurring within a 12-month interval.
Fluid-containing cysts: may represent an infectious process and are not classified in Lung-RADS unless other concerning features are identified.
Multiple cysts: may indicate an alternative diagnosis such as Langerhans cell histiocytosis (LCH) or lymphangioleiomyomatosis (LAM) and are not classified in Lung-RADS unless other concerning features are identified.