“…An AF should have one or more of the following characteristics to be named ''atypical'': different localization and origin [1,[4][5][6][7][8][9][10][11][12], atypical symptoms [13], different age distribution (younger than 7-year-old or older than 25-year-old) [4,6,[14][15][16], female sex [1,6,8,14,[17][18][19], atypical histopathology [3,7,12,15] and multifocal feature [16].…”