Chocolate cysts (endometriomata)

Case contributed by Dr Abhinav Ranwaka


Pelvic pain since 1 year.

Patient Data

Age: 27
Gender: Female

Right ovarian cystic lesion. It appears hyperintense on T1 & T1FS images, and shows T2 shortening (shading) due to repeated haemorrhage within the lesion.

The shading sign is an MRI finding typically seen in an endometrioma. The sign is seen on T2 weighted sequences of lesions that are hyper-intense on T1, and consists of low signal (T2 shortening) affecting variable portions of the cyst.

Case Discussion

An endometrioma (chocolate cyst) is a localised form of endometriosis (usually within the ovary). It contains dark degenerated blood products following repeated cyclical haemorrhage. 

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Case information

rID: 25072
Case created: 2nd Oct 2013
Last edited: 18th Oct 2017
System: Gynaecology
Inclusion in quiz mode: Included

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