“…The literature contains 43 patients with the hair collar sign [Novy, 1938;Farmer and Maxmen, 1960;Commens et al, 1989;Singman et al, 1990;Sinclair et al, 1992;Toriello et al, 1993;Evers et al, 1994;Khallouf et al, 1994;Drolet et al, 1995a,b;Lees et al, 2000;Federici et al, 2004;Tiang et al, 2004;Fujita et al, 2005;Herron et al, 2005;Rogers et al, 2005;Neilan et al, 2006]. Including the 2 patients in this report, there are 22 males, 22 females, and 1 in which the sex was not specified.…”