Endometriosis may rarely be found in the perineum.

Most cases are associated with an episiotomy scar.


The patient presents with a painful perineal mass with cyclic changes in size and symptoms.


The patient may have a history of endometriosis elsewhere.


MRI shows a multilobular cystic mass with inner hemorrhage.



(1) involvement of the anal sphincter

(2) malignant transformation

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