Rhinology and Sinus Surgery: Inflammation, Obstruction, and Surgical Anatomy
Rhinology questions test your ability to separate inflammatory from structural causes of nasal obstruction and to apply evidence-based medical therapy before surgery. Understand the ostiomeatal complex as the drainage pathway for the maxillary, anterior ethmoid, and frontal sinuses, and know that the sphenoid drains separately. Know the Lund-Mackay staging and that CT is the imaging standard for chronic rhinosinusitis (CRS) after failed medical therapy.
Differentiate CRS with and without nasal polyps. CRSwNP is often type 2 inflammation (eosinophilic), associated with asthma and aspirin-exacerbated respiratory disease (AERD: asthma, polyps, aspirin sensitivity). First-line therapy is saline irrigation plus intranasal corticosteroids; add antibiotics only for acute exacerbations. Understand when to escalate to functional endoscopic sinus surgery (FESS) and the key surgical landmarks: middle turbinate, uncinate process, ethmoid bulla, and the skull base and orbit as the critical boundaries.
Traps: assuming all polyps are allergic (unilateral polyps in an adult warrant evaluation for inverted papilloma or malignancy); missing orbital or intracranial complications of acute bacterial rhinosinusitis (periorbital edema, proptosis, vision change, meningismus); and forgetting that aspirin desensitization can help AERD patients. Also know that allergic fungal rhinosinusitis produces eosinophilic mucin and requires surgical debridement plus medical therapy.
Rule of thumb: "Medical therapy first for CRS; surgery for failure, complications, or structural obstruction."
Worked example: A 40-year-old with bilateral polyps, asthma, and aspirin sensitivity has failed saline and intranasal steroids. Consider a short course of systemic steroids and, if refractory, FESS; discuss aspirin desensitization for long-term control.