Ectopic glial tissue in the occipital scalp.

Résumé fourni par la source

Case Report A newborn female infant was admitted to the Neuro- surgical Service, Naval Hospital, Camp Pendleton, California, in January 1968.The child had been born with a flat, dark-red lesion in the occipital scalp, very slightly to the left of the midline near the inion.The lesion was slightly depressed from the surrounding scalp and contained no hair.It was not tender.The dark reddish colour did not blanch with finger pressure.Bone was palpable under the defect and there was no visible sinus tract (Fig. 1).Skull x-rays were normal.In particular, there was no evidence of a bony defect underlying this lesion.A tentative diagnosis of ectodermal dysplasia of the scalp was mad-, with the possibility that this might represent the dysplasia overlying an intracranial dermoid.On the third post-partum day, excisional biopsy of the lesion was performed.It was seen to be completely free of the skull and, upon very careful dissection, there was no stalk extending to the skull.A small burr hole was made in the skull underlying the lesion, and the dura was inspected and opened to make sure there was no underlying dermoid.There was none.The dura was closed and the scalp was brought together easily and closed with 4-0 dermalon.The wound healed by first intention and the child has since remained neurologically normal, as she was before the examination.Histological examination of this material revealed sections of skin with a depressed area in the centre of the tissue (Fig. 2).Under this region, the adnexal structures were decreased or totally absent.To each side of the lesion were numerous hair follicles, sebaceous glands, and sweat glands, and within the lesion were collections of glial cells partially surrounded by leptomeninges.At the bottom of the tissue there was a small rim of collagenous connective tissue surrounding the glial tissue and meningeal tissue.One piece of skin revealed ulceration of the surface with infiltration of polymorphonuclear leucocytes and some fibrin.No ganglion cells were found in the lesion (Fig. 3).The ectopic tissue was located completely within the dermis and subcutaneous tissue.There was no evidence of malignancy.

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