The difficulty in diagnosing X linked adrenoleucodystrophy and the importance of identifying cerebral involvement.

Two patients are described, a mother and son, who were initially clinically diagnosed with hereditary spastic paraparesis. This was rectified after very long chain fatty acid testing confirmed adrenomyeloneuropathy (AMN). The son's initial symptoms were characteristic of AMN (the commonest phenotype) but progressed to show symptoms of cerebral involvement. This evolution from non-cerebral to cerebral AMN is recognised in the medical literature and is increasingly important to consider in light of the availability of potential treatments such as haematopoietic stem cell transplantation. 2015 BMJ Publishing Group Ltd.