Low-grade endometrial stromal sarcoma arising from sciatic nerve endometriosis.
BACKGROUND
Endometrial stromal sarcoma arising from extrauterine endometriosis is a rare and not easily diagnosed tumor. We present a case arising from sciatic nerve endometriosis in a 50-year-old woman.


METHODS
The patient had a long history of endometriosis and presented with a left buttock mass and motor deficit. Magnetic resonance imaging showed a large tumor of the sciatic nerve with pelvic extension. She underwent total hysterectomy, bilateral salpingo-oophorectomy, and excision of pelvic endometriotic pockets, allowing the diagnosis of low-grade endometrial stromal sarcoma arising from endometriosis. She received systemic chemotherapy, gonadotropin-releasing hormone agonist therapy, and palliative radiation therapy, but her disease progressed.


CONCLUSIONS
Aggressive endometriosis raises important diagnostic and therapeutic difficulties and may correspond to misdiagnosed rare malignant neoplasms, which should be treated.
Lacroix-Triki
Magali
M
Department of Pathology, Institut Claudius Regaud, Toulouse, France. lacroix_m@icr.fnclcc.fr
Beyris
Laurent
L
Martel
Pierre
P
Marques
Bernard
B
D001707:Biopsy, Needle; D002471:Cell Transformation, Neoplastic / Q000473:pathology*; D003131:Combined Modality Therapy; D018450:Disease Progression; D016889:Endometrial Neoplasms / Q000473:pathology* / Q000628:therapy; D004715:Endometriosis / Q000473:pathology* / Q000503:physiopathology; D017809:Fatal Outcome; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007813:Laparotomy; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D009367:Neoplasm Staging; D018714:Radiotherapy, Adjuvant; D018203:Sarcoma, Endometrial Stromal / Q000473:pathology* / Q000628:therapy; D012584:Sciatic Nerve / Q000473:pathology*