title: [Paranasal sinus surgery -- preoperative CT lowers bleeding risk].
mesh_terms: D000328:Adult; D005005:Ethmoid Sinus / Q000098:blood supply / Q000000981:diagnostic imaging; D005260:Female; D006470:Hemorrhage / Q000517:prevention & control*; D006801:Humans; D008297:Male; D011300:Preoperative Care; D012307:Risk Factors; D012852:Sinusitis / Q000000981:diagnostic imaging* / Q000601:surgery*; D014057:Tomography, X-Ray Computed