title: Endometriosis of the soleus and gastrocnemius muscles.
abstract: OBJECTIVE
  To document a rare case of endometriosis in the soleus and gastrocnemius muscles.
  
  
  METHODS
  Case report.
  
  
  METHODS
  Tertiary care center.
  
  
  METHODS
  A 30-year-old fertile woman presented with moderate dysmenorrhea associated with calf pain and bulging that had been gradually worsening over the last years, particularly during menses. A mass in the soleus and gastrocnemius muscles was identified in ultrasonography and magnetic resonance imaging.
  
  
  METHODS
  Endometriosis was diagnosed by incisional biopsy on the basis of histopathology, and wide excisional biopsy was performed.
  
  
  METHODS
  Unusual clinical presentation of endometriosis.
  
  
  RESULTS
  The patient was disease free for 2 months. Recurrence of the lesion was then diagnosed, and a new surgical approach was planned.
  
  
  CONCLUSIONS
  Endometriosis in muscles is a rare event, and existing theories are not totally sufficient in explaining it.
authors.affiliation: Department of Surgery and Anatomy, Faculty of Medicine, University of São Paulo, Ribeirão Preto, Brazil.
authors.forename: Omero Benedicto
authors.initials: OB
authors.lastname: Poli-Neto
authors.forename: Júlio César
authors.initials: JC
authors.lastname: Rosa-E-Silva
authors.forename: Hermes Freitas
authors.initials: HF
authors.lastname: Barbosa
authors.forename: Francisco José
authors.initials: FJ
authors.lastname: Candido-Dos-Reis
authors.forename: Antonio Alberto
authors.initials: AA
authors.lastname: Nogueira
mesh_terms: D000328:Adult; D004412:Dysmenorrhea / Q000175:diagnosis; D004715:Endometriosis / Q000175:diagnosis*; D005260:Female; D006801:Humans; D018482:Muscle, Skeletal / Q000473:pathology*; D009135:Muscular Diseases / Q000175:diagnosis* / Q000473:pathology; D010146:Pain / Q000175:diagnosis