Parasitic leiomyoma

Dr Aditya Shetty and Radswiki et al.

A parasitic leiomyoma is a considered a type of extra-uterine leiomyoma and presents as peritoneal pelvic benign smooth-muscle masses separate from the uterus. 

It likely originates as a pedunculated subserosal leiomyoma that twists and torses from its uterine pedicle. The contact with the uterus is then lost. 

Once free in the peritoneal cavity, it then survives by recruiting neo-vascularisation from adjacent structures. The originating pedunculated fibroid likely develops pre-menopausally, whereas the parasitic leiomyoma may become clinically evident either before or after menopause.

Occasionally a broad ligament leiomyoma is also classified under parasitic leiomyomas 4.

On imaging, a parasitic leiomyoma shows tissue characteristics similar to uterine leiomyoma. 

With behaviour similar to uterine leiomyoma, a parasitic leiomyoma may recur after resection or, conversely, may show hormone-responsive behaviour, including size stability or even shrinkage with natural, surgical, or chemical menopause. 

Surgery is usually performed for symptomatic relief or to prevent impingement of vital structures.

The differential for a parasitic leiomyoma varies with its location can include 

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Article information

rID: 15069
System: Gynaecology
Tag: cases
Synonyms or Alternate Spellings:
  • Parasitic leiomyomas
  • Parasitic fibroid
  • Parasitic fibroids

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