Chocolate cysts (endometriomata)

Case contributed by Dr Abhinav Ranwaka


Pelvic pain since 1 year.

Patient Data

Age: 27
Gender: Female
Modality: MRI

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

Modality: MRI

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: 9th Sep 2015
System: Gynaecology
Inclusion in quiz mode: Included

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