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We measured the dimensions of the normal auricle in microtia patients and those of both auricles in their parents, and compared the findings with data obtained in normal individuals. The physiognomical auricular length and width dimensions of the normal auricles in microtia patients were significantly smaller than those in normal individuals. The auricular length of the parents of microtia patients was also significantly smaller than in normal individuals. The auricles of the parents on the same side as those affected by microtia in the patients tended to be smaller than those on the contralateral side.