“…As they are deep structures, the anatomical study of the frontal sinuses was difficult for a long time: the frontal bone needed to be sawn or drilled until X-rays were discovered by Wilhelm R€ ontgen in 1895. A strong genetic determination has been observed in some family samples, particularly in cases of absence (Blandino and Longo, 1956;Caggioli, 1961;Holmes and Walton, 1969), even if differences have been reported in the frontal sinuses of monozygotic twins (Asherson, 1963); several congenital syndromes have been identified involving the morphology of the frontal sinuses and their absence (Mocellin, 1968;Holmes and Walton, 1969;Reyes de la Rocha et al, 1987). The existence of a sexual dimorphism mentioned by some authors, in particular larger frontal sinuses in males than females, remains controversial (Szilvassy, 1981(Szilvassy, , 1982Yoshino et al, 1987;Harris et al, 1987a, b;Ponde et al, 2008;Goyal et al, 2013).…”