A disorder that has been reported in four men from a three-generation family. Onset manifests by spastic paraplegia at the age of 2, followed by tremor, ataxia, optic atrophy, and spastic tetraparesis. Transmission is X-linked and the gene responsible of the disease may be located at Xq25-q27.

Anteriorly-facing nostrils viewed with the head in the Frankfurt horizontal and the eyes of the observer level with the eyes of the subject. This gives the appearance of an upturned nose (upturned nasal tip).