Deviasi Septum Hidung

01Pathophysiology

The nasal septum is a midline structure composed of the quadrilateral cartilage anteriorly, the perpendicular plate of the ethmoid superiorly, and the vomer posteroinferiorly. These components articulate at suture lines that serve as active growth centers during childhood and adolescence. Any asymmetric growth at these junctions, or any external force applied to the developing or mature septum, can produce a deviation from the midline.

Deviation narrows the nasal passage on the side of the deflection, directly increasing nasal airflow resistance on that side. Patients therefore report unilateral nasal obstruction that worsens during upper respiratory infections or allergic episodes because mucosal edema further narrows an already compromised airway. On the contralateral (wider) side, a phenomenon called compensatory inferior turbinate hypertrophy frequently develops. The turbinate enlarges because the wider passage allows excessive airflow, and the mucosa responds with chronic engorgement. This is why some patients eventually develop bilateral obstruction despite the septum deviating to only one side, a concept that is commonly tested.

Deviation also disrupts the normal laminar airflow within the nasal cavity. The resulting turbulent airflow dries the overlying mucosa, predisposing to crusting and recurrent epistaxis, particularly along the anterior septum at Kiesselbach plexus (Little area). Furthermore, a deviated septum can obstruct the ostiomeatal complex, impairing sinus drainage and predisposing the patient to recurrent or chronic rhinosinusitis.

02Classification and Clinical Manifestation

A key teaching point: anterior deviations near the internal nasal valve (the angle between the upper lateral cartilage and the septum, normally 10 to 15 degrees) produce symptoms disproportionate to their apparent size because this is the area of greatest airflow resistance in the entire upper airway.

03Diagnostic Workup

Anterior rhinoscopy is the best initial step. Using a nasal speculum and headlight, the examiner can directly visualize the septum, identify the direction and location of the deviation, and inspect the mucosa for crusting, bleeding points, or polyps. This is sufficient to make the diagnosis in the majority of cases.

Nasal endoscopy with a flexible or rigid scope is the next step when the posterior nasal cavity needs evaluation, or when associated pathology (polyps, adenoid hypertrophy, tumors) must be excluded. It is particularly useful for identifying posterior deviations that anterior rhinoscopy may miss.

CT of the paranasal sinuses in coronal sections is the most accurate study and is considered the standard preoperative imaging. It provides a detailed map of the deviation (cartilaginous vs. bony component), identifies associated findings such as concha bullosa (pneumatized middle turbinate) that may contribute to obstruction, and evaluates the sinuses for concurrent disease. CT is not required to make the diagnosis but is essential before planning surgical correction.

The Cottle maneuver is a clinical pearl: if pulling the cheek laterally relieves obstruction, the problem may involve the nasal valve rather than (or in addition to) the septum itself. This distinction matters for surgical planning.

04Management and Treatment

The first step in a patient presenting with unilateral nasal obstruction and a documented deviated septum is a trial of medical therapy. Intranasal corticosteroids (fluticasone or mometasone, one to two sprays per nostril once daily) reduce mucosal edema and may provide adequate symptom relief without surgery. Saline nasal irrigation is an effective adjunct. Topical decongestants such as oxymetazoline should be limited to 3 to 5 days maximum to avoid rhinitis medicamentosa (rebound nasal congestion from prolonged use), a commonly tested concept.

If medical therapy fails after an adequate trial (typically 4 to 6 weeks), the next best step is septoplasty. This is the definitive and most commonly tested surgical answer. The procedure involves elevating mucoperichondrial flaps, removing or reshaping the deviated portions of cartilage and bone, and replacing the straightened septum in the midline. Nasal packing or splints are placed postoperatively for 24 to 48 hours.

When the deviation is accompanied by external nasal deformity (cosmetic or functional), septorhinoplasty addresses both components simultaneously. If compensatory inferior turbinate hypertrophy is contributing to bilateral obstruction, turbinate reduction should be performed at the same time as septoplasty.

In children, surgery is avoided whenever possible because the septum contains active growth cartilage. Premature resection can lead to saddle nose deformity due to loss of dorsal support and impaired nasal growth. The exception is severe obstruction causing sleep-disordered breathing or failure to thrive, where benefits outweigh risks.

Contraindications to septoplasty include active cocaine use (causes septal perforation and poor healing), uncontrolled bleeding disorders, and granulomatous diseases affecting the septum (granulomatosis with polyangiitis, sarcoidosis) where the underlying condition must be treated first.

05Differential Diagnosis and Distractors

06Traps and High-Yield Pearls

The most common way students lose points on this topic is by jumping straight to septoplasty when the question describes a patient with mild symptoms. The tested principle is that medical therapy (nasal corticosteroid spray and saline irrigation) should always be tried first unless the obstruction is severe or the question stem explicitly states failure of conservative treatment. Septoplasty is the answer only when medical management has been attempted and failed.

A second frequent trap involves compensatory turbinate hypertrophy. A vignette may describe bilateral nasal obstruction and the student dismisses septal deviation because "the obstruction is bilateral." Recognizing that the contralateral turbinate can hypertrophy in response to a unilateral deviation is the concept being tested.

Third, in pediatric patients, students often select surgery too quickly. The tested pearl is that septoplasty should be deferred until nasal growth is complete to protect septal growth centers, unless the clinical situation demands earlier intervention.

Finally, watch for the vignette describing an adolescent male with unilateral obstruction and epistaxis. Students may reflexively choose "deviated septum" as the answer, but the combination of adolescent male, unilateral obstruction, and recurrent profuse nosebleeds should raise concern for nasopharyngeal angiofibroma, where biopsy is contraindicated and imaging is the next step. The core competency being tested is the ability to distinguish a benign structural variant (deviated septum) from a vascular tumor that requires a completely different management approach.