Investigation
Plain X-rays are of limited value in the
assessment of sinus disease. A minimum of four views
namely
occipitomental, occipitofrontal, submentovertical and lateral views —
are required to
demonstrate the paranasal sinuses adequately. Computerised tomography (CT)
scanning is far superior in demonstrating sinus pathology. Coronal and axial
scans are necessary for detailed assessment.
Nasal
airway resistance can be assessed by means of rhinomanometry which can be
performed by either active or passive techniques. It may be used to quantify
pre- and post-medical and surgical treatment for nasal obstruction and for the
assessment of response to treatments for rhinitis.
Both
rigid and flexible naso endoscopes can be used for direct visualisation of the
nasal fossa and the paranasal sinuses. Endoscopic techiques can be used for
diagnosis and treatment.