. CHOREA Walker and colleagues reviewed clinical and laboratory features of neuroacanthocytosis (NA). NA was divided into three groups: 1. the “core” NA syndromes with BG neurodegeneration, comprising AR ChAc due to mutations in the VPS13 A gene, and X-linked McLeod syndrome (MLS) due to mutation of the XK gene on the X chromosome. 2. conditions associated with decreased serum lipoprotein levels, namely, abetalipoproteinemia (Bassen– Kornzweig syndrome) and hypo-betalipoproteinemia, characterize