[Spinal lipoma associated with a neuromuscular hamartoma. Report of one case].

A 6 year-old boy with urinary incontinence, sensory loss and spastic weakness in lower limbs underwent surgical repair for low-lying spinal cord ending in an intradural lipoma. Within the lipoma, bundles and fascicles of striated muscles fibers were intimately associated with nerve fibers. This extremely rare histological appearance has been reported as benign "triton tumor". Our case allows a discussion of its histogenesis.