title: [Analysis of misdiagnosis of the skull base lesions with PET-CT].
abstract: OBJECTIVE
  To investigate the causes of misdiagnosis for skull base lesions by PET-CT, and to recognize the working principal and the false-positive results of PET-CT for reducing the misdiagnosis rate.
  
  
  METHODS
  The lesions of case 1 involved the pharynx nasalis, pterygopalatine fossa, and orbital apex base of skull, and the lesions of case 2 involved the base of sella were performed with CT, MRI and PET-CT examination. Both of the cases were treated with surgery and histopathologic examination.
  
  
  RESULTS
  Two cases were diagnosed as nasopharyngeal carcinoma and carcinoma of base of sella by PET-CT, respectively. However, they were finally diagnosed mycosis and pituitary tumor by histopathologic examination after operation.
  
  
  CONCLUSIONS
  PET-CT examination in the skull base lesions may give false-positive result. Both clinical information and other imaging examinations should be considered to reduce the misdiagnosis skull base lesions only by PET-CT.
authors.affiliation: Department of Otolaryngology, Xiangya Hospital,Central South University, Changsha, 410008, China.
authors.forename: Jinjie
authors.initials: J
authors.lastname: Sun
authors.forename: Weihong
authors.initials: W
authors.lastname: Jiang
authors.forename: Suping
authors.initials: S
authors.lastname: Zhao
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
mesh_terms: D003951:Diagnostic Errors; D005260:Female; D006801:Humans; D008875:Middle Aged; D049268:Positron-Emission Tomography; D019291:Skull Base / Q000000981:diagnostic imaging*; D019292:Skull Base Neoplasms / Q000000981:diagnostic imaging