title: Role of dynamic CT perfusion study in evaluating various intracranial space-occupying lesions.
abstract: OBJECTIVE
  Differentiating intracranial mass lesions on CT scan is challenging. The purpose of our study was to determine the perfusion parameters in various intracranial space-occupying lesions (ICSOL), differentiate benign and malignant lesions, and differentiate between grades of gliomas.
  
  
  METHODS
  We performed CT perfusion (CTP) in 64 patients, with age ranging from 17 to 68 years, having space-occupying lesions in brain and calculated relative cerebral blood flow (rCBF) and relative cerebral blood volume (rCBV).
  
  
  RESULTS
  We found significantly lower perfusion in low-grade gliomas as compared to high-grade tumors, lymphoma, and metastases. Similarly in infective lesions, TWT and abscesses showed significantly lower perfusion compared to TOT. In ring enhancing lesions, capsule of TWT showed significantly lower perfusion as compared to abscesses, TOT, and metastases.
  
  
  CONCLUSIONS
  Thus, in conclusion, infective lesions can be differentiated from tumors like lymphomas, high-grade gliomas, or metastases based on perfusion parameters. The cut off value of rCBV 1.64 can be used to differentiate between low grade and high grade gliomas. However, depending only on perfusion parameters, differentiation between the tumors like lymphomas, high-grade gliomas, and metastases may not be possible.
authors.affiliation: Department of Radiology, Vikram Hospital, Bangalore, Karnataka, India.
authors.forename: Ravindra B
authors.initials: RB
authors.lastname: Kamble
authors.affiliation: Department of Radiology, Khoula Hospital, Muscat, Oman.
authors.forename: Peruvumba N
authors.initials: PN
authors.lastname: Jayakumar
authors.affiliation: Department of Radiology, University of Maryland Medical Center, Baltimore, Maryland, United States.
authors.forename: Ravishankar
authors.initials: R
authors.lastname: Shivashankar
keywords: Abscesses; CT perfusion; gliomas; metastasis; tuberculomas