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Postoperative cholestea recurrence through the posterior wall

was preserved. Of these, 160 operations were performed on chronic ears with cholesteatomas and for acute or serous mastoiditis, save for 6 which were carried out for the purpose of facial decompression as described by Lewis (1956) and Sade et al. (1965). Of the 160 ears with cholesteatomas, 123 patients underwent a simple attico-antrotomy as a preparatory stage for tympanoplasty and, in 37 cases the attico-antrotomy and tympanoplasty were performed in one stage (Smyth et al., 1967). Altogether, 177 patients (96 per cent) appeared for follow-up.