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KMID : 0357919820160010072
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Korean Journal of Pathology
1982 Volume.16 No. 1 p.72 ~ p.75
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Congenital Dermal Sinus of the Posterior Cranial Fossa -Report of a Case-
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장은덕(張鎭德)/Eun Deuk Chang
심상인(沈相仁)/이종무(李鍾流)/Sang In Shim/Chong Moo Lee
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Abstract
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Congnital dermal sinus is any depression or tract lined with stratified squamous
epithelium which apparently result from defective separation of the neuroectoderm from
the epithelial ectoderm along the mid-dorsal aspect of the embryo between the third and
fifth week of intrauterine life. It occurs most frequently in the lumbosacral region and
the next in the occiput. This dermal sinus may extends all the way into the spinal
canal or cranial cavity. Because of its persistent communication with the skin surface,
such a sinus tract servos as a constant potential port of entry for infection into the
central nervous system.
We have experienced a case of occipital dermal sinus of 5 months old male baby, who
was admitted to Catholic Medical Center, for high fever, vomiting and a small palpale
mass at the occipital scalp. Computed topography showed a round low density lesion
wilt ring enhancement in the posterior fossa. An operation was given to reveal sinus
tract started at the skin and extended into the posterior fossa forming a cyst, 4cm in
diameter, which was located between cerebellar hemispheres. The cyst was filled with a
yellowish white cheesy material containing hairs. Microscopically, the cyst was lined by
stratified squamous epithelium and appendageal structures such as hair follicles and
sweat glands.
The sinus tract was also lined with stratified squamous epithelium. Total excision of
the cyst and dermal sinus tract was performed, and the postoperative course was
uneventful.
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