Ovarian endometrioma - shading sign
Chronic pelvic pain.
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The right ovary is enlarged, containing a well-defined lobulated cystic lesion (4.7 x 4.5 x 4.2 cm) of high signal on T1/T1 fat sat, T2 shading sign with double fluid-fluid levels, and thick peripheral fibrous capsule. No peripheral enhancement seen on postcontrast sequences.
Bilateral small follicles are noted.
A small Nabothian cyst otherwise normal appearance of the uterus.
MRI features of an ovarian endometrioma.