Abstract
FOR MANY YEARS, during irrigations of the maxillary or the sphenoid sinuses, I have been measuring the amount of irrigating solution which the sinus would hold before overflowing. This I have called the overflow capacity. The procedure takes only a few seconds additional time and gives some information. If the sinus overflows at once, it is obvious that it is filled with pus, mucus, thickened mucous membrane, polypi, cysts, tumors or a combination of these. If the cavity of the antrum holds 12 or 15 cc. before overflowing, it is very likely a normal sinus. Of course, this procedure is no substitute for roentgenograms or for roentgenograms taken with iodized poppyseed oil 40 per cent. In some cases it may be misleading. This is illustrated in the following case: <h3>CASE 1</h3> On April 18, 1945, C. P. S., an engineer 45 years of age, was seen with the complaint that
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