Congenital Scalp Lesion

Abstract

CASE FOR DIAGNOSIS Congenital Scalp Lesion Una lesión congénita en el cuero cabelludo Case presentation A 3-day-old newborn who was born at full term and had no past history of interest was evaluated for the presence of a congenital lesion on the vertex. Examination revealed a 9-mm, skin-colored pedunculated papule located on the midline (Fig. 1). Skin ultrasound was performed with an Esaote Gamma MyLab system with a variable frequency (10--22 MHz) probe. B-mode ultrasound revealed a well-defined hyperechoic dermoepidermal lesion that had a lobulated lower contour and did not affect the calvaria (Fig. 2A). Abundant vascularization was observed in color Doppler mode (Fig. 2B). In the absence of calvarial involvement and intracranial invasion, tangential excision of the lesion and electrocoagulation of the bed was performed to rule out malignancy and the presence of a vascular lesion. Histology showed multiple sebaceous glands in the papillary dermis beneath a preserved epidermis (Fig. 3A). Examination of successive sections revealed the presence of a lesion composed of papillary structures connected to the follicular infundibulum (Fig. 3B). These papillary structures were lined with a row of columnar epithelial cells that