Mature cystic teratoma
Check up ultrasound identified a hyperechoic lesion in the right ovary and was referred for an MRI for further characterization of the lesion.
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A small well-defined oval-shaped lesion is seen within the right ovary measuring 12x8 mm in maximal transverse diameter. It shows hyperintense signal in both T1 and T2 WIs with total suppression on T1 fat saturated images, the findings highly in favor of an ovarian dermoid cyst (mature cystic ovarian teratoma).
Left ovary is not seen in the image (likely is removed as the patient has tow times previous surgical history unknown left ovarian cyst).
Uterus is normal in size with normal zonal anatomy. No free fluid is seen.
Mature cystic teratoma is a very common benign ovarian lesion, also called dermoid cyst.
Mature in this context means benign, as opposed to the immature, malignant teratoma.
Benign cystic teratomas typically occur in young women of child-bearing age.
At imaging they are usually unilocular (up to 90%) but can be multilocular, and are bilateral in ~15%.
Up to 60% may contain calcifications.
The cystic component is fluid fat, produced by sebaceous glands.