Chocolate cysts (endometriomata)

Case contributed by Dr Abhinav Ranwaka


Pelvic pain for one year.

Patient Data

Age: 30 years
Gender: Female

Right ovarian cystic lesion. It appears hyperintense on T1 and 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
Published: 2nd Oct 2013
Last edited: 2nd May 2018
System: Gynaecology
Inclusion in quiz mode: Included

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