抄録
Case 1. K. O., four year old boy, chiefly complained of an abscess formation on the right mastoid. This lesion had relapsed repeatedly at intervals of a few months during over 2 years.
When he was admitted, the opening of the fistula auris congenita existing at the right crus helicis showed no evidence of inflammation. However, the fistula was diagnosed to be the cause of the recurrent inflammation of the mastoid inferring from the characteristic history (Fig. 2). This diagnosis was proved to be correct by the operation (Fig. 3).
Case 2. M. K., twenty-one year old boy, showed a clinical picture similar to case 1.
In this case, however, an exact diagnosis was obtained before the operation by methylen blue injection into the abscess through the fistula (Fig. 4 and 5).
Case 3. S. S., twenty year old girl, had two fistulae of the marginal helicine type on both sides, but of which the right one only had been frequently infected.
Case 4. Y. H., thirty year old man, complained of a somewhat large hole accompanied by severe itching on the right praeauricular region.
The operation revealed that 4 more daughter fistulae grew out of the hole (Fig. 6).
The fistulae or their cord-like endings had fast adhered to the periosteum of the auricle, but by complete extirpation carefully performed and the application of antibistics, successful healing was obtained in all cases.
