A rare syndrome characterized by intellectual deficit, spasticity in the lower limbs (spastic paraplegia), pes cavus deformity of both feet, an abnormal gait, and palmar and plantar hyperkeratosis.

Cone-shaped epiphyses (also known as coned epiphyses) are epiphyses that invaginate into cupped metaphyses. That is, the epiphysis has a cone-shaped distal extension resulting from increased growth of the central portion of the epiphysis relative to its periphery.