SUBCORTICAL BAND HETEROTOPIA
Imaging for optimized detection of subcortical band
Whilst subcortical band heterotopia may be seen on USS and CT
(depending on severity), MRI is the imaging of choice for assessing
the detail and associated structural abnormalities. MRI should
include thin slice volumetric T1-weighted images, axial and coronal
T2-weighted and FLAIR images.
Imaging characteristics of subcortical band heterotopia:
- a band of grey matter is seen, located between the
ventricle and cortex, this can be of variable thickness (can be
subtle in some areas), and may be duplicated (i.e. a double
band) in the temporal lobes
- the overlying cortex may be normal or may show shallow sulcation.
- Anterior predominance of banding is recognized with DCX
mutations, posterior predominance with LIS1 mutations
Imaging in subcortical band heterotopia
The images below are all from the same patient, and show pachygyria (broad simple gyri) anteriorly and subcortical band heterotopia posteriorly (SBH, arrows).