“…However, in most cases, involvement of the second ear appears only as disease progresses. All authors also agree that the longer the duration of the disease, the greater the percentage of bilaterality [Morrison, 1975;Charachon, 1989;Stahle and Bergman, 1967;Thomas and Harrison, 1971;Green et al, 1991;Havia et al, 2002;Havia and Kentala, 2004]. Most authors, with the exception of Morrison [1975], have come to the conclusion that involvement of both ears usually occurs within a short period of time, i.e.…”