[It's normal--structural and functional variations of nose and paranasal sinuses].

Many nasal symptoms can be caused by normal variation in nasal structure or functioning. External nasal deformity necessitates further examinations only when remarkable or causing nasal blockage. Septal deformities are often seen also in patients without any symptoms. The size of nasal turbinates and the number or size of paranasal sinuses may vary causing sometimes problems in the interpretation of radiological imaging. Abnormal radiological findings can be detected also in asymptomatic patients, most commonly mucosal thickening and cysts of paranasal sinuses. Meticulous clinical examination including decongestation of nasal mucosa is a key for sorting out meaningful connection between symptoms and findings.