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CASE REPORTS
JOURNAL ARTICLE
Pelvic abscess from enterobius vermicularis. Report of a case with cytologic detection of eggs and worms.
Acta Cytologica 2001 May
BACKGROUND: Enterobius vermicularis is known to produce perianal and ischioanal abscesses and invade the peritoneal cavity via the female reproductive system, causing pelvic peritonitis. However, there are only rare case reports on the cytodiagnosis of these parasitic lesions.
CASE: A 28-year-old woman was admitted with a tender left iliac fossa mass and greenish vaginal discharge. Ultrasonogram and computed tomography scan confirmed the presence of a mass lesion suggestive of a tuboovarian abscess. Cytologic examination of the pus obtained during left salpingo-oophorectomy revealed the presence of ova of E vermicularis and fragments of the adult worm in an inflammatory exudate consisting predominantly of neutrophils, eosinophils and occasional epithelioid cell granulomas. Paraffin sections of the tuboovarian mass showed necrotizing epithelioid cell granulomas, but neither ova nor any worm section was identified. Although the possibility of tuberculosis was considered histologically, Ziehl-Neelsen (Z-N) stain for acid-fast bacilli was negative. Z-N staining of the smear and mycobacterial culture of the pus also did not yield positive results.
CONCLUSION: E vermicularis may cause tuboovarian abscess with necrotizing epithelioid granulomas mimicking tuberculosis. Cytologic examination of the pus is helpful in the diagnosis.
CASE: A 28-year-old woman was admitted with a tender left iliac fossa mass and greenish vaginal discharge. Ultrasonogram and computed tomography scan confirmed the presence of a mass lesion suggestive of a tuboovarian abscess. Cytologic examination of the pus obtained during left salpingo-oophorectomy revealed the presence of ova of E vermicularis and fragments of the adult worm in an inflammatory exudate consisting predominantly of neutrophils, eosinophils and occasional epithelioid cell granulomas. Paraffin sections of the tuboovarian mass showed necrotizing epithelioid cell granulomas, but neither ova nor any worm section was identified. Although the possibility of tuberculosis was considered histologically, Ziehl-Neelsen (Z-N) stain for acid-fast bacilli was negative. Z-N staining of the smear and mycobacterial culture of the pus also did not yield positive results.
CONCLUSION: E vermicularis may cause tuboovarian abscess with necrotizing epithelioid granulomas mimicking tuberculosis. Cytologic examination of the pus is helpful in the diagnosis.
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