Endometriosis at the knee. A case report.

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This case report details a rare instance of endometriosis affecting the knee in a 32-year-old woman, which was initially misdiagnosed as synovial sarcoma on frozen section and should be considered in the differential diagnosis of extremity swelling in menstruating women.

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Abstract

A review of the world literature since 1928 failed to disclose a case of endometriosis affecting the knee. In the case of a 32-year-old women, synovial sarcoma was suspected on the basis of the histologic findings on frozen section, but final pathologic sections showed endometriosis. Synovial sarcoma classically consists if malignant stoma containing gland-like clefts and is easily confused with endometriosis. Affecting the extremities, endometriosis is rare. The condition should new be added to the differential diagnosis of extremity swelling in actively menstruating women.

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Condition tags

endometriosis

MeSH descriptors

Choristoma Endometriosis Endometrium Knee Joint Adult Biopsy Choristoma Danazol Danazol Endometriosis Endometriosis Endometriosis Female Humans Joint Diseases Joint Diseases Joint Diseases

Citation neighborhood

Papers in the corpus that this work cites (lower rings, blue) and that cite this one (upper rings, green). Dot size scales with the paper's in-corpus citation count — bigger dot = more influential within the endo/adeno field. Click a dot to open that paper. [ expand to 2 hops ] — adds papers reached through this work's immediate citers/citees. Heavier; up to 60 extra dots.

Cited by (14)

Source provenance

europepmc
last seen: 2026-09-27T09:11:36.575535+00:00
openalex
last seen: 2026-06-04T00:00:01.174412+00:00
pubmed
last seen: 2026-05-13T22:10:00.881616+00:00
License: CC0 · commercial use OK