Persistent primitive hypoglossal artery associated with brain stem ischemia in a young patient

Study carried out at Instituto de Cirurgia da Base do Crânio (ICBC), Porto Alegre RS, Brazil. Department of Neurosurgery and Skull Base Surgery, Hospital Ernesto Dornelles, Porto Alegre RS, Brazil. Correspondence: Carlos Eduardo da Silva; Departamento de Neurocirurgia e Cirurgia da Base do Crânio, Hospital Ernesto Dornelles; Avenida Ipiranga 1801 / 26; 90160-093 Porto Alegre RS Brasil; E-mail: dasilvacebr@yahoo.com.br / carlos@icbc-neurocirurgia.com.br Conflict of interest: There is no conflict of interest to declare Received 27 March 2012; Received in final form 24 June 2012; Accepted 03 August 2012