[The recessus frontalis and its clinical aspects (author's transl)].

The so-called frontal recess (recessus frontalis) is a variable developed space of the anterior air cells, which is usually called "ductus" or "canalis naso-frontalis". As it leads into the frontal sinus, the state of the frontal sinus is entirely dependent on the conditions within the frontal recess. Its anatomical situation and transport of the secretion are described. The frontal recess may be influenced by narrow passes of the middle nasal meatus. All these facts are discussed in normal or abnormal states of nasal function. The clinical signs and sequelae of a diseased frontal recess are reported. For exact diagnosis nasal endoscopy, especially of the middle meatus, is recommended, apart from x-ray tomography or other clinical investigations. The various endoscopic findings are demonstrated. Finally, the indications are given for endoscopic operations, suggestions for endoscopic possibilities, and a detailed description of the technical procedure.