"fluid–fluid level: least common"
"homogenous shading: most prevalent pattern in endometriomas"
"The shading sign is an MRI finding typically seen in an endometrioma. It may also be seen with some endometrioid tumours (e.g. endometrioid carcinoma of the ovary) and uncommonly other blood-containing lesions (e.g. haemorrhagic corpus luteum cysts)."
"There are different patterns of appearance 3:"