What is the recommended approach to diagnose a deviated nasal septum in an adult patient with a history of rhinitis medicamentosa?

Diagnosis of Deviated Nasal Septum

Diagnose a deviated nasal septum through anterior rhinoscopy using a nasal speculum with appropriate lighting or an otoscope with nasal adapter, which will reveal caudal septal deformity and assess the degree of airway obstruction. 1

Physical Examination Approach

External Nasal Assessment

• Inspect the external nose for deviation or deformity that may suggest previous trauma, as a deviated/deformed nose externally often correlates with internal septal deviation 1
• Perform the Cottle maneuver by pulling the patient's cheek laterally to open the nasal valve angle—improvement in breathing suggests nasal valve pathology that may coexist with septal deviation 1
• Assess nasal valve patency and look for alar collapse during inspiration 1

Anterior Rhinoscopy (Primary Diagnostic Method)

• Use a nasal speculum with appropriate lighting or an otoscope with nasal adapter to perform anterior rhinoscopy, which is the standard initial diagnostic approach 1
• Identify caudal septal deformity in the anterior nasal cavity, as this is the most clinically significant location affecting the nasal valve area responsible for more than 2/3 of airflow resistance 2
• Document inferior turbinate hypertrophy, particularly on the side opposite the deviation, as compensatory turbinate enlargement commonly accompanies significant septal deflection 1
• Apply topical decongestant (such as phenylephrine) and re-examine after 5-10 minutes to distinguish mucosal edema from bony hypertrophy of the turbinates 1

Advanced Visualization (When Indicated)

• Use rigid or flexible nasopharyngoscopy for better visualization of the middle meatus, posterior septum, sinus ostia, and posterior choanae when anterior rhinoscopy is insufficient or when evaluating for concurrent sinonasal disease 1
• Perform posterior rhinoscopy using a mirror or nasopharyngoscope to complete the examination 1

Important Clinical Context

Distinguishing Clinically Significant Deviation

• Recognize that approximately 80% of the general population has some degree of septal asymmetry, but only 26% have clinically significant deviation causing symptoms requiring intervention 2, 3
• Correlate physical findings with symptoms such as continuous nasal airway obstruction, mouth breathing, or sleep disturbance to determine clinical significance 2

Assessment in Rhinitis Medicamentosa Context

• Examine the nasal mucosa carefully for hyperemia and signs of chronic topical decongestant overuse, as the mucosa is usually reddened with overuse of topical decongestant sprays 1
• Distinguish between structural obstruction from septal deviation and mucosal congestion from rhinitis medicamentosa by applying topical decongestant and reassessing—structural obstruction will persist despite mucosal shrinkage 1
• Document both the septal deviation and the degree of turbinate hypertrophy, as patients with rhinitis medicamentosa often have both structural and inflammatory components 1

Imaging Considerations

When to Order CT Imaging

• CT imaging is NOT required for diagnosis of deviated nasal septum, as clinical examination is sufficient 3
• Reserve CT scanning for presurgical planning when septoplasty is being considered, to evaluate the extent of deviation and identify anatomic variants 4
• Order CT scan if concurrent chronic rhinosinusitis is suspected (symptoms >8 weeks including facial pain/pressure, purulent drainage, or reduced sense of smell) to assess sinus disease and guide combined surgical approach 2, 5, 6

Common Diagnostic Pitfalls

• Do not assume all visible septal deviations require treatment—only those causing continuous nasal airway obstruction with failed medical management meet criteria for intervention 2
• Avoid attributing all nasal obstruction to septal deviation in patients with rhinitis medicamentosa, as mucosal inflammation is often the primary contributor 1
• Do not overlook compensatory turbinate hypertrophy on the side opposite the deviation, as this contributes significantly to obstruction and affects treatment planning 1, 7