Table 1:

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

Patient No.	Tumor Characteristics		Conventional MR Imaging							Diffusion Tensor Imaging
Patient No.	Location	Size (cm)	T1W	T2W	Enhancement	Focality	Necrosis	Mass Effect	Hydrocephalus	Corticospinal Tracts	Transverse Pontine Tracts	Sensory Tracts
1	Midbrain/pons	4.6 × 3.6	Hypo	Hyper	No	No	No	Moderate	Shunt in place	Bilateral sev exp, distinct CB	Sev exp of left tract	Posterior displ, noninfiltrated
2	Pons	3.0 × 3.4	Hypo	Hyper	No	No	No	Minimal	No	Mild exp, lateral displ of right tract	Sev bilateral exp	Posterior displ, noninfiltrated
										Mild reduction, medial deviation, and slightly isotropic left tract
3	Pons	2.8 × 3.1	Hypo	Hyper	No	No	No	Minimal	No	Bilateral sev exp, minimal posterior displ of right tract	Mild bilateral exp	Normal
4	Pons	3.2 × 4.3	Sev hypo	Sev hyper	No	No	No	Minimal	No	Bilateral sev exp	Sev bilateral exp	Bilateral grossly posterior displ (left > right)
5	Pons	3.8 × 4.5	Sev hypo	Sev hyper	Surrounding necrosis	No	Yes^*	Moderate	Mild	Bilateral sev exp, distinct CB	Sev bilateral exp, necrosis	Bilateral grossly posterior displ (left > right)
6	Pons	3.9 × 4.7	Sev hypo	Sev hyper	No	No	No	Mild	No	Bilateral sev exp, posterior displ, distinct right CB	Sev prominently anterior exp	Bilateral grossly posterior displ (left > right)
7^†	Pons	1.6 × 1.0	Hypo	Hyper	Minimal focal	Yes	No	Minimal	No	Mild exp of left tract	Normal	Normal
		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.