title: Ethmoidal osteoid osteoma with orbital and intracranial extension - a case report.
abstract: BACKGROUND
  Osteoid osteoma is a benign bone neoplasm which is seen in the long bones of appendicular skeleton. It is rarely seen in the cranium. Skull base osteoid osteoma is extremely rare and has been anecdotally reported.
  
  
  METHODS
  The authors report a case of a large osteoid osteoma of the ethmoid with intraorbital and intracranial extension in a 33 year old male patient. He presented with loss of vision in the left eye. The intra-cranial extension was excised through a single burr-hole fronto-orbitotomy. The ethmoid and orbital portions were approached and excised through a Weber-Ferguson incision and inferior orbitotomy. Radical excision of the tumor could thus be achieved through a craniofacial approach.
  
  
  CONCLUSIONS
  Although benign and rare, skull base osteoid osteoma can present with neurological deficit due to its mass effect and involvement of vital structures. A multispeciality team approach is advisable in such cases if radical excision is to be achieved. A craniofacial approach made radical single stage excision of this multicompartmental osteoid osteoma possible with an uneventful postoperative period.
authors.affiliation: Department of Neurosurgery, M.S. Ramaiah Medical College, Gokula, Bangalore 560054, India.
authors.forename: S Balaji
authors.initials: SB
authors.lastname: Pai
authors.affiliation: Department of Surgical Oncology, M.S. Ramaiah Medical College, Bangalore, India.
authors.forename: K
authors.initials: K
authors.lastname: Harish
authors.affiliation: Department of Plastic Surgery, M.S. Ramaiah Medical College, Bangalore, India.
authors.forename: M S
authors.initials: MS
authors.lastname: Venkatesh
authors.affiliation: Department of Plastic Surgery, M.S. Ramaiah Medical College, Bangalore, India.
authors.lastname: Udayshankar
authors.affiliation: Department of Pathology, M.S. Ramaiah Medical College, Bangalore, India.
authors.forename: Deepthi
authors.initials: D
authors.lastname: Jermely