title: Multicystic oligodendroglioma with calvarial destruction.
abstract: BACKGROUND
  Calvarial erosion is known to occur with some superficially located tumors. Very few case reports of calvarial erosion associated with oligodendroglioma are reported in the literature, but calvarial destruction with oligodendroglioma is very rare.
  
  
  OBJECTIVE
  To report an unusual case of multicystic frontoparietal oligodendroglioma with destruction of the calvaria and scalp involvement in the absence of prior surgery or radiation.
  
  
  METHODS
  A 30-year-old male presented with the history of left focal seizure with secondary generalization for last three to four years along with left sided weakness for the past one month. There was history of slowly progressive decreased vision in both eyes leading to complete blindness in both eyes for the past one month. On neurological examination, patient had left hemiparesis of grade-2/5 with perception of light absent in both eyes. Fundus examination revealed bilateral optic atrophy. Magnetic resonance imaging (MRI) of the brain showed a large supratentorial heterogenous multicystic ring enhancing mass lesion involving right frontal lobe, right frontotemporal opercular region, and posteriorly abutting the central sulcus and anteriorly destroying the calvaria. Patient underwent right frontoparietal craniotomy and near total excision of tumor. Histopathological examination revealed oligodendroglioma WHO grade-2. Patient received postoperative chemoradiotherapy.
  
  
  RESULTS
  At nine month follow-up patient neurological status was same and his seizure was controlled on single AED. There was no recurrence of seizure at nine month of follow-up.
  
  
  CONCLUSIONS
  Calvarial destruction in association with extra and intra axial neoplasm should include oligodendroglioma especially in patients with long history of symptoms, although calvarial destruction is very rare. However, the final diagnosis is established by means of histopathological examination.
authors.affiliation: Department of Neurosurgery, Brijlal Hospital and research Centre, Haldwani, Uttrakhand, India.
authors.forename: Ajay
authors.initials: A
authors.lastname: Bajaj
keywords: Calvarial; destruction; multicystic; oligodendroglioma