A congenital dermal sinus is a scaly, multi-layered channel of tissue found along the body’s midline anywhere between the nasal bridge and the tailbone. The tract may end just below the skin surface or may extend to portions of the spinal cord, skull base or nasal cavity.
Congenital dermal sinus is an uncommon form of cranial or spinal dysraphism. It occurs in 1 in 2500 live births. It occurs as a dermal indentation, found along the midline of the neuraxis and often presents alongside infection and neurological deficit.
Although problematic sacral dimple in newborn is rare 6), sacral dimple can be associated with a congenital dermal sinus tract, which is a type of closed spinal dysraphism characterized by an epithelium-lined sinus tract extending inward from the skin surface for a variable distance often into the lining of the spinal cord (thecal sac) 7).
Dermal sinus tracts (DSTs) are remnants of incomplete neural tube closure during embryologic development. The incidence is reported to be 1 in 2500 live births. Dermal sinus tracts can be associated with spinal fluid drainage, intradural dermoid or epidermoid cysts, and spinal cord tethering. 1.