<prompt> Ohngrens line extends from-Lateral canthus of the eye to angle of mandibleMedial canthus of eye to angle of mandibleMedial canthus of eye to tragusTragus to angle of mandible  <response>: Ans. is b i.e., Medial canthus of eye to angle of mandible Qhngrens lineo In head and neck cancer, Ohngrens line is a line that connects the medial canthus of the eye to the angle of the mandibleo The line defines a plane orthogonal to a sagittal plane that divides the maxillary sinus into 1 an anterior-inferior part, and 2 a superior-posterior part.o Tumours that arise in the anterior-inferior part, i.e. below Ohngrens line, generally have a better prognosis than those in the other groupo Addition to above a vertical line through pupil is also considered, which divides the above mentioned structures into 4 different regions. The structures at posterosuperior medial have worst prognosis and that at anteroinferior medial are least dangerous. 