What it is
Adrenomyeloneuropathy (AMN) is a form of X-linked adrenoleukodystrophy. AMN patients generally have spinal cord dysfunction, which leads to the initial symptoms that include difficulties in walking or a change in the walking pattern. The average age at which symptoms first appear is 28, but onset can occur anywhere from the second to the fifth decades of life.
AMN can be broken down into two general clinical forms: AMN with cerebral involvement (the spinal cord and brain are both affected), and AMN without cerebral involvement (only the spinal cord is affected). Of patients with AMN, approximately 54% have normal brain function, while 46% have brain involvement of varying degrees.
Plenty of additional information at the links below. Certainly these guys know WAY more than me.