**There are other essential points to be checked as well:**

**Mouth opening:** of at least 3 cm is necessary for successful laryngoscopy.

**Mallampati** classification can provide valuable and essential information about the size of the tongue in relation to the oral cavity and is a useful predictor of ease of intubation.

**Size of the mandibular space:** 2 fingerbreadths or more suggest easy intubation. **Can the patient assume the sniffing position?** Ability to assume this position is predictive of a relatively straight axis to the glottis.

**Endoscopic examination:** to localize any narrowing and assess its significance.

**CT scanning with 3D reconstruction and virtual bronchoscopy:** is especially valuable in evaluating the size and extent of lesions. Three-dimensional reconstruction with virtual endoscopy improves the ability to more fully assess head and neck tumors and its extension and encroachment on the airway [9].
