title: Sciatica due to extrapelvic heterotopic ossification: a case report.
abstract: BACKGROUND
  Sciatica is a common problem, usually caused by disc herniation or spinal stenosis. Low back pain is also present in most cases. When sciatica is the unique clinical finding, especially in young patients, extraspinal pathology should be investigated.
  
  
  METHODS
  We describe a rare case of sciatica in a 32-year-old man, which was developed as a complication of post-traumatic pelvic heterotopic ossification. During the operation, the sciatic nerve was found to be bluish, distorted and compressed in an hourglass fashion around a heterotopic bone mass. The heterotopic bone tissue, 4 cm in diameter, was removed and the patient had fully recovered 3 months after the operation.
  
  
  CONCLUSIONS
  In cases of sciatica without back pain, the possibility of direct pressure of the sciatic nerve from cysts, tumours or bone, as in the present case, should be considered.
authors.affiliation: Department of Orthopaedics, University Hospital of Patras, Rion Patras, Greece. ecpanagi@med.upatras.gr
authors.forename: Elias C
authors.initials: EC
authors.lastname: Panagiotopoulos
authors.forename: Spyros A
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authors.initials: A
authors.lastname: Plotas
authors.forename: Gregorios
authors.initials: G
authors.lastname: Tsigkas
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Dimopoulos
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