Endometriomas on ultasound appear as
Endometrioma  classically is cystic with homogenous, low-level internal echoes, i.e ground-glass echogenicity.
Solid with diffuse internal low-level echoes.
Solid with focal internal low-level echoes.
Cystic with diffuse internal low-level echoes.
Cystic with focal hyperechoic internal echoes.