Table 1:

Comparison of conventional MR imaging and diffusion tensor imaging measures in 7 pediatric patients with pontine tumors

Patient No.Tumor CharacteristicsConventional MR ImagingDiffusion Tensor Imaging
LocationSize (cm)T1WT2WEnhancementFocalityNecrosisMass EffectHydrocephalusCorticospinal TractsTransverse Pontine TractsSensory Tracts
1Midbrain/pons4.6 × 3.6HypoHyperNoNoNoModerateShunt in placeBilateral sev exp, distinct CBSev exp of left tractPosterior displ, noninfiltrated
2Pons3.0 × 3.4HypoHyperNoNoNoMinimalNoMild exp, lateral displ of right tractSev bilateral expPosterior displ, noninfiltrated
Mild reduction, medial deviation, and slightly isotropic left tract
3Pons2.8 × 3.1HypoHyperNoNoNoMinimalNoBilateral sev exp, minimal posterior displ of right tractMild bilateral expNormal
4Pons3.2 × 4.3Sev hypoSev hyperNoNoNoMinimalNoBilateral sev expSev bilateral expBilateral grossly posterior displ (left > right)
5Pons3.8 × 4.5Sev hypoSev hyperSurrounding necrosisNoYes*ModerateMildBilateral sev exp, distinct CBSev bilateral exp, necrosisBilateral grossly posterior displ (left > right)
6Pons3.9 × 4.7Sev hypoSev hyperNoNoNoMildNoBilateral sev exp, posterior displ, distinct right CBSev prominently anterior expBilateral grossly posterior displ (left > right)
7Pons1.6 × 1.0HypoHyperMinimal focalYesNoMinimalNoMild exp of left tractNormalNormal
1.0 × 0.8
  • Note:—hypo indicates hypointense; hyper, hyperintense; sev, severe; exp, expansion; CB, corticobulbar tracts; displ, displacement.

  • * The necrotic region measured 2.2 × 2.5 cm.

  • This patient’s tumor had an exophytic component that measured 1.0 × 0.8 cm.