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Notes:

Simple cyst is a unilocular cyst with a smooth thin wall, acoustic enhancement, and no internal elements(anechoic).

Nonsimple unilocular smooth cyst is a unilocular cyst with smooth thin wall and internal echoes or containing >=1 incomplete smooth thin septum.

Unilocular cyst with irregular inner wall is a cyst with inner wall or incomplete septum irregularity <3 mm in height.

Unilocular cyst with solid components is a cyst with solid elements whose height >=3 mm in the form of nodule or papillary projection from the wall or septum.