Medknow Publications on behalf of the Neurological Society of India
Abstract
A "Hot Cross Bun" sign on T2-weighted MRI was described as a result of
selective loss of myelinated transverse pontocerebellar fibers and
neurons in the pontine raphe with preservation of the pontine tegmentum
and corticospinal tracts (CST). However, neuropathologic studies showed
contradicting results with no sparing of the CST. This is a pictorial
and quantitative demonstration of the sign on diffusion tensor imaging
and tractography, which provides the imaging evidence that is
consistent with neuropathologic findings