title: Endometriosis presenting like a psoas abscess.
abstract: Endometriosis is the presence of ectopic endometrial tissue that responds to hormonal stimulation. Although endometriosis occurs most often in the pelvis, several unusual sites have been reported. We present a case of endometriosis mimicking, a psoas abscess. A 39-year-old lady presented with pain around the right hip, of 5 years duration. Computed tomography CT scan showed a multi-loculated mass in the right iliopsoas muscle. On exploration, a hemorrhagic cystic mass was seen pressing on the femoral nerve. The lesion was excised and histological examination of the tissue showed features of endometriosis. The patient was treated by cyclic hormonal suppressive therapy for 3 months. Her pain and the flexion deformity of the hip resolved completely. Retroperitoneal endometriosis presenting with deformity and pain in the hip may mimic a psoas abscess. If the possibility of this diagnosis is entertained, inappropriate treatment may be avoided.
authors.affiliation: Department of Orthopedics, Kasturba Medical College and Hospital, Manipal 576104, India. shyambhatn@yahoo.com
authors.forename: Shyamasunder N
authors.initials: SN
authors.lastname: Bhat
authors.forename: Simanchal P
authors.initials: SP
authors.lastname: Mohanty
authors.forename: Prahlad
authors.initials: P
authors.lastname: Kustagi
mesh_terms: D000328:Adult; D003937:Diagnosis, Differential; D004715:Endometriosis / Q000175:diagnosis* / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D016659:Psoas Abscess / Q000175:diagnosis*; D012187:Retroperitoneal Space; D014057:Tomography, X-Ray Computed