Table 2.

MRI characteristics in a series of patients with delayed posthypoxic leukoencephalopathy

No.	Time to MRI1 (days)	Morphology of signal abnormality	Symmetry	T2-FLAIR/ADC mismatch	Spared structures	Mass effect or gyral edema	Contrast enhancement	Hemorrhage
1	40	Patchy	Yes	T2-FLAIR more extensive than ADC	U-fibers, brainstem, basal ganglia, thalami, cerebellum	No	No	No
2	50	Homogeneous	Yes	T2-FLAIR more extensive than ADC	Same as above	No	No	No
3	54	Patchy	Yes	Matched T2-FLAIR/ADC	Same as above	No	No	No
4	30	Homogeneous	Yes	T2-FLAIR more extensive than ADC	Same as above	No	No	No
5	20	Patchy	Yes	Matched T2-FLAIR/ADC ADC	Same as above	No	No	No

¹Time to MRI abnormality since the original hypoxic event (during relapse).

MRI, magnetic resonance imaging; ADC, apparent diffusion coefficient; FLAIR, fluid-attenuated inversion recovery.