TY - JOUR AU - Bonifazi, E. PY - 2015/12/31 Y2 - 2024/03/28 TI - Relations between dermal sinus, aplasia cutis and collar sign. JF - European Journal of Pediatric Dermatology JA - Eur. J. Pediat. Dermatol. VL - 25 IS - 4 SE - DO - 10.26326/2281-9649.25.4.1172 UR - https://ejpd.com/index.php/journal/article/view/1172 SP - 244 AB - The cranial dermal sinus is related to an incomplete fusion of the neural tube level with the cephalic end; so originates a fistula that starting from the skin can end in the underlying soft tissue or cross the skull and connect the skin with the meningo-encephalic structures. The presence of the dermal sinus is often betrayed by the presence of a collar of thicker hairs (hair collar sign); however, this sign can also be found around other neoplasms (3).<br />The presence of a gray, soft elastic plaque, sometimes surrounded by thicker hairs and often at the center of a salmon patch is more indicative of an embryonic malformation.<br />However, the hair collar sign can also be found around membranous aplasia cutis (2); moreover, the latter may be preceded by a bullous stage where meningeal tissue can be histologically shown (1). ER -