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This is an MRI of the brain in a

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child with developmental delay.

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And if we look on the T2-weighted imaging,

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we're seeing ill-defined gray-white

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differentiation posteriorly

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in the occipital lobes.

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If I go to the sagittal T1-weighted image,

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I actually get a little better delineation.

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I see the cortex at the periphery.

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Intervening is an area of white matter.

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The myelinated white matter looks bright

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on T1 weighted imaging.

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And then following that,

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beneath the surface,

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I'm seeing an additional area of gray matter like signal.

0:39

This is band-type heterotopia.

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In the absence of a significant lissencephaly

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spectrum disorder.

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The band heterotopia is seen most pronounced

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posteriorly in this individual.

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Anteriorly here in the frontal lobes,

0:55

we're seeing gray matter and subjacent white matter,

0:58

without band heterotopia,

1:00

we're not seeing any significant

1:03

lissencephaly appearance.

1:05

So this is band heterotopia in

1:07

the absence of lissencephaly.

1:10

If we look at this coronal STIR image,

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you can see it a little bit better than

1:15

the original T2-weighted image.

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And then one trick you can do is you can actually,

1:19

on a STIR or a T2-weighted image,

1:21

you can invert from a gray-white perspective.

1:24

And that sometimes makes it almost look

1:26

similar to a T1-weighted image.

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And you can see this band of gray matter

1:31

going beneath the cortical surface.

1:34

It's a little more evident than it

1:35

was without the inversion.