Abstract:
The area of the maxil- lary antrum in Waters' view has been measured in 68 patients using a mechanical planimeter. The mean area was 6.04+0.25 cm 2. The part of the antrum lateral to the inno- minate line (defined as the paratem- poral segment) has a mean area of 0.72+0.07 cm 2. The latter dimi- nishes in small antra and approches zero when the total antral area falls below 3.48 cm 2. It is proposed that the innominate line (Stenvers), or its extension, descends lateral to the field of the small maxillary sinus and may be used as an additional sign of such abnormality.
