Nasal Endoscopy — How It Works, Benefits & Recovery — Procedure Guide, Recovery & Risks | MyMedicPlus

Nasal endoscopy (rhinoscopy) is a minimally invasive procedure using a thin rigid or flexible endoscope — a 2.7–4 mm diameter illuminated optical instrument — inserted through the nostril to directly visualise the nasal passages, the ostiomeatal complex (the drainage pathway for the anterior ethmoid, maxillary, and frontal sinuses), the nasal polyps, the nasopharynx, and the Eustachian tube orifices. Rigid nasal endoscopes (0°, 30°, 70° viewing angles) provide superior image quality for the clinic or operating theatre setting; flexible nasopharyngoscopes offer greater manoeuvrability in awake patients for complete nasopharynx and laryngeal assessment. Diagnostic nasal endoscopy is performed in the outpatient clinic setting after topical decongestant (oxymetazoline) and topical local anaesthetic spray, taking 5–15 minutes. Therapeutic endoscopic nasal surgery — functional endoscopic sinus surgery (FESS) — is a distinct operative procedure performed under general or local anaesthesia to surgically open the sinus drainage pathways and remove diseased tissue. Nasal endoscopy has largely replaced anterior rhinoscopy (examination with a simple nasal speculum and headlight) as the gold standard assessment tool in rhinology, providing direct illuminated visualisation of areas inaccessible to anterior rhinoscopy.

This treatment represents an important component of modern medical management, supported by clinical evidence from multiple randomised controlled trials and systematic reviews. Treatment protocols are continually refined based on emerging evidence to optimise patient outcomes while minimising treatment burden.

Patient suitability is assessed through a structured multidisciplinary evaluation incorporating clinical history, physical examination findings, and results of relevant investigations. Treatment planning considers the full clinical context including disease characteristics, patient comorbidities, functional status, and individual treatment goals to ensure the most appropriate therapeutic approach is selected for each patient.

Diagnostic nasal endoscopy is indicated for evaluation of chronic nasal symptoms that have not responded to empirical medical therapy or where a structural or pathological cause needs to be excluded. Primary indications include: chronic rhinosinusitis with or without nasal polyps — to assess extent of polyps, identify any anatomical obstruction, and confirm diagnosis before CT scanning or surgery; unilateral nasal obstruction or discharge where malignancy or unilateral polyp must be excluded; recurrent nosebleeds (epistaxis) to identify the bleeding vessel (Kiesselbach's plexus anteriorly or posterior vessels); suspected nasal or nasopharyngeal tumour; assessment after endoscopic sinus surgery to monitor healing and debride crusts; CSF rhinorrhoea (clear fluid dripping from the nose) to identify the site of dural defect; and evaluation of anosmia (loss of smell) and nasal septal perforation. Functional endoscopic sinus surgery (FESS) is indicated for: chronic rhinosinusitis failing 3 months of maximal medical therapy (intranasal corticosteroid, saline irrigation, antibiotics for acute exacerbations), symptomatic nasal polyposis, orbital or intracranial complications of sinusitis, mucocoele, and selected cases of benign sinonasal tumour. Pre-FESS CT of the paranasal sinuses (Lund-Mackay score) is mandatory for surgical planning.

For diagnostic nasal endoscopy in the outpatient clinic: the patient is seated upright. Oxymetazoline nasal spray is applied to decongest the mucosa and improve visualisation of the nasal passages. After 5 minutes, topical local anaesthetic (2% lignocaine with co-phenylcaine spray) is applied. The endoscope is introduced along the floor of the nose to the nasopharynx, then withdrawn and redirected medially and superiorly through the middle meatus to inspect the ostiomeatal complex, middle turbinate, and sinus ostia. The three-pass technique systematically examines (1) the floor, inferior turbinate, and nasopharynx; (2) the middle meatus, ethmoidal bulla, and uncinate process; (3) the superior meatus and olfactory cleft. For functional endoscopic sinus surgery (FESS): performed under general anaesthesia (preferred) with the patient supine and head slightly elevated. Image guidance (navigation) using intraoperative CT registration improves safety at the skull base and orbit. Vasoconstrictor-soaked pledgets (adrenaline 1:10,000) reduce mucosal bleeding. Under endoscopic visualisation, the uncinate process is resected (uncinectomy) to open the maxillary sinus ostium, the ethmoid sinuses are dissected (ethmoidectomy), and the frontal recess opened (Draf I–III depending on extent). Polyps are removed with powered microdebriders. Haemostasis is achieved; resorbable packing may be placed. The procedure lasts 1–3 hours depending on extent.

The procedure is performed in an appropriately equipped facility by experienced specialist clinicians. Prior to commencement, the patient undergoes pre-procedural assessment including vital signs measurement, review of relevant investigations, and confirmation of informed consent. Intravenous access is established and monitoring equipment including ECG, pulse oximetry, and blood pressure monitoring is applied.

The procedural site is prepared according to aseptic technique standards. Anaesthesia or analgesia is administered as appropriate for the specific procedure and patient needs, ranging from local anaesthesia for minor procedures to regional or general anaesthesia for more complex interventions.

The procedure is performed under direct visualisation or image guidance as appropriate. Key technical steps are executed with attention to anatomical landmarks and patient safety parameters. Haemostasis is achieved and confirmed before completion. Post-procedural assessment includes clinical evaluation of the immediate result, complication surveillance, and documentation of the procedure.

Recovery room monitoring continues until the patient meets defined discharge criteria. Written post-procedural instructions covering activity restrictions, wound care, medication management, and symptoms requiring urgent review are provided before discharge.

Diagnostic nasal endoscopy transforms the accuracy of rhinological assessment, identifying mucosal pathology, structural abnormality, and occult tumours that are invisible on anterior rhinoscopy or nasal speculum examination. It provides direct visualisation essential for biopsy of suspicious lesions and real-time guidance of nasal polyp grading. Functional endoscopic sinus surgery achieves significant symptom improvement in 75–90% of patients with chronic rhinosinusitis failing medical therapy, including improvement in SNOT-22 (Sino-Nasal Outcome Test) scores by 30–40 points on average. Successful sinus surgery enables adequate delivery of intranasal corticosteroid sprays and saline irrigation to previously obstructed sinuses, improving long-term disease control. Nasal polyp removal by FESS restores nasal airway patency and smell function in the majority of patients; however, recurrence is common (30–40% at 5 years) and long-term maintenance with intranasal corticosteroids and regular endoscopic surveillance is essential. Anterior skull-base CSF leak repair by endoscopic endonasal approach achieves closure rates of 90–95% with minimal morbidity. Dacryocystorhinostomy (DCR) for blocked tear duct via the endonasal endoscopic route achieves 90% success rates equivalent to the external approach without a facial scar.

Diagnostic nasal endoscopy in the outpatient setting is extremely safe with minimal risk. Transient discomfort from instrumentation and occasional mild nosebleed are the only common side effects. Vasovagal reaction (fainting) is possible in anxious patients when the scope contacts the posterior pharynx. For functional endoscopic sinus surgery (FESS), the most serious complications relate to the proximity of the paranasal sinuses to the orbit and anterior skull base. Orbital complications include periorbital haematoma (bruising around the eye), orbital haematoma requiring lateral canthotomy decompression (0.1%), and extraocular muscle injury causing diplopia (0.1%). Intracranial complications include CSF leak from anterior skull base violation (0.2–0.5%), which may require immediate endoscopic repair or lumbar drain; meningitis (rare); and intracranial haematoma (very rare). Haemorrhage requiring nasal packing or return to theatre occurs in 1–2%. The sphenopalatine artery is at risk in posterior ethmoidectomy. Anosmia following aggressive olfactory cleft surgery is an uncommon but important risk. Adhesion formation between the middle turbinate and lateral nasal wall (synechiae) causes post-operative obstruction and is managed with regular post-operative debridement.

After diagnostic outpatient nasal endoscopy, no recovery is required and patients may drive and resume all activities immediately. After functional endoscopic sinus surgery (FESS), patients are discharged on the same day or after one night. Dissolvable nasal packing (if used) is removed at 24–48 hours. Profuse nasal bleeding, severe headache, visual disturbance, or new neurological symptoms after FESS require immediate emergency department attendance. Nasal irrigation with isotonic or hypertonic saline solution (NeilMed Sinus Rinse or similar) — 240 mL per nostril twice daily — commences 24–48 hours post-operatively and is continued for 3–6 months. It is the single most important post-operative intervention for sinus healing. Intranasal corticosteroid spray restarts at 2–4 weeks once mucosal healing is established. Post-operative endoscopic debridement under topical anaesthetic (removal of crusts, blood clots, and adhesions) is performed at 1, 4, and 8 weeks — critical for optimal sinus opening and healing. Strenuous activity, nose-blowing, and heavy lifting are avoided for 2–3 weeks. Return to office work occurs at 1–2 weeks; physical work at 3–4 weeks. Regular endoscopic review at 3, 6, and 12 months monitors healing and detects early polyp recurrence.