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The author made a statistical observation in 122 cases of chronic otitis media treated by the radical mastoidectomy. Complete wound healing was seen in 62.3% of the total number cases. Among those with incomplete wound healing, the difficulty was seen in window niche in 37.0%, at the orifice of the eustachian tube in 28.2%, in hypotympanum in 23.9%, in promontorium in 8.7%, in perilabyrinth or sinodural angle in 8.7%, in retrofacial area in 6.5%, in attic 4.3% and in perisinous area in 2.2%. In 49 cases reoperated, the pathology was found to be seen in the cells and mucosa in most of the cases. In 15 cases of which numbers the result of the operation appeared to be satisfactory at first but no complete healing could be established. Microscopic examination of these cases revealed the failure of healing to be the presense of pathological mucosa that interfered with proper epidermization. Morphologically, the pathological mucosa was classified into 9 different types. The most conspicuous change was the infolding of the mucosa and cyst formation. The cyst has also been observed beneath the epidermis where the clinical healing for a period of time had been satisfactory. It is impossible to remove the mucosa completely during the opration, nor is it possible to zation superimposing the impreventable mucous membrane which when examined microscopically will show cyst formation and air cavity, the proximal end of the eustachian tube. The pathological bone does not always interrupt the epidermization. The author could find one tympanic gland out of all cases. This one was a single tubal gland and it's blind end tended to form a cyst.

STUDIES ON THE HEALING PROCESS OF OPERATED TEMPORAL BONE OF CHRONIC OTITIS MEDIA