**1.8 Differential diagnosis**

Most of the time rhinitis or upper respiratory tract infection are mistakenly diagnose as sinusitis. Maxillary toothache can also be mistaken as pain appeared in maxillary sinusitis. Besides this vascular headache, tension headache, epidural abscesses, brain abscesses, subdural empyema, meningitis and foreign bodies are also madly mistaken as sinusitis [10].
