title: Diffusion weighted MR imaging in the differential diagnosis of haemangiomas and metastases of the liver.
abstract: BACKGROUND
  The purpose of the study was to evaluate the value of diffusion-weighted imaging in the differential diagnosis of haemangiomas from metastases of the liver.  PATIENTS AND METHODS.: We analyzed 69 lesions in 38 patients (33 haemangiomas; 36 metastases) in the retrospective study. Diffusion-weighted imaging was performed using a breath-hold single-shot echo-planar spin echo sequence with three b factors (0, 500 and 1000 sec/mm(2)), and apparent diffusion coefficients (ADCs) were calculated. For the quantitative evaluation, signal intensity of the lesions, lesion-to-liver signal intensity ratios, ADC of the lesions, and lesion-to-liver ADC ratios were compared between the groups. The statistical significance was determined by student's-t test.
  
  
  RESULTS
  With the b factor 500 sec/mm(2), no statistical significance was achieved (p>0.05). With the b factor of 1000 sec/mm(2), both the signal intensity and lesion-to-liver signal intensity ratio of the metastases were significantly higher than those for haemangiomas (p<0.001). The cut-off value at 2.6 yielded a sensitivity of 86% and a specificity of 82% for the lesion-to-liver signal intensity ratio. The ADC, and lesion-to-liver ADC ratio of the metastases were significantly lower than those of haemangiomas (p<0.001). With cut-off value of 1.7, ADC ratio had a sensitivity of 88% and a specificity of 72% for ADC lesion/liver.
  
  
  CONCLUSIONS
  Diffusion-weighted imaging with high b value may help in the differential diagnosis of metastases from haemangiomas of the liver.
authors.affiliation: Department of Radiology, University of Kocaeli, Kocaeli, Turkey.
authors.forename: Nagihan
authors.initials: N
authors.lastname: Inan
authors.forename: Furkan
authors.initials: F
authors.lastname: Kilinc
authors.forename: Tahsin
authors.initials: T
authors.lastname: Sarisoy
authors.forename: Sevtap
authors.initials: S
authors.lastname: Gumustas
authors.forename: Gur
authors.initials: G
authors.lastname: Akansel
authors.forename: Ali
authors.initials: A
authors.lastname: Demirci