Epidemiology & Risk Factors

Intranasal substance abuse: Cocaine (potent vasoconstriction → local ischemia, necrosis, and chondrocyte death).
Trauma & Iatrogenic:
- Prior nasal surgery (septoplasty, rhinoplasty).
- Repeated bilateral chemical/cautery for epistaxis.
- Digital trauma (chronic nose picking) or foreign bodies.
- Prolonged nasotracheal intubation or bilateral nasal packing.
Systemic inflammatory / Vasculitides:
- Granulomatosis with polyangiitis (GPA) (most common rheumatologic cause).
- SLE, Behçet disease, Sarcoidosis.
Infections:
- Syphilis (tertiary gumma), Tuberculosis, Leishmaniasis.
- Invasive fungal sinusitis (Mucor, Aspergillus) in immunocompromised/DKA.
Malignancy: Extranodal NK/T-cell lymphoma (nasal type), Squamous cell carcinoma (SCC).
Medications / Toxins: Chronic topical decongestants (oxymetazoline), nasal steroid overuse, occupational exposure (chromium, nickel, arsenic).

Clinical Features

Key History:
- Whistling noise during nasal breathing (classic buzzword for small anterior perforations). c
- Recurrent epistaxis and persistent dry crusting.
- Sensation of nasal obstruction or fullness despite anatomical defect (due to disturbed laminar airflow).
- Rhinorrhea, foul-smelling nasal discharge, or facial pain.
Physical Examination:
- Anterior rhinoscopy/endoscopy: Defect visible in the cartilaginous septum (most frequently at the Kiesselbach plexus / Little’s area).
- Mucosal borders: Friable, erythematous, ulcerated, or encrusted.
- External inspection: Loss of dorsal support leading to saddle-nose deformity (depressed nasal dorsum).

Initial Step:
- Anterior rhinoscopy or flexible nasal endoscopy: Direct visualization of the perforation site, size, and mucosal edge characteristics.
Etiologic Workup:
- Urine toxicology screen (UDS): Rapid screen for cocaine metabolites (benzoylecgonine).
- Key Labs:
  - c-ANCA / PR3-ANCA: Elevated in GPA.
  - ANA, ESR/CRP: Evaluation for SLE and active systemic inflammation.
  - RPR / VDRL, QuantiFERON-TB: Rule out chronic infectious granulomas.
Imaging:
- CT maxillofacial / paranasal sinuses: Assesses extent of cartilaginous/bony destruction and evaluates for invasive skull base or sinus pathology.
Confirmatory / Tissue Biopsy:
- Biopsy of mucosal edges: Indicated for non-traumatic, unexplained, progressive, or atypical lesions.
- Differentiates necrotizing vasculitis (GPA) from malignancy (NK/T-cell lymphoma, SCC) and fungal invasion.

Granulomatosis with Polyangiitis (GPA):
- Differentiated by (+) PR3-ANCA / c-ANCA, pulmonary nodules/cavitations, and glomerulonephritis (hematuria, RBC casts).
Cocaine-Induced Midline Destructive Lesion (CIMDL):
- Differentiated by (+) UDS, absence of systemic pulmonary/renal disease, and atypical p-ANCA (anti-human neutrophil elastase).
Extranodal NK/T-cell Lymphoma (Nasal Type):
- Differentiated by rapidly progressive destructive midfacial lesion, biopsy showing EBV-positive atypical lymphoid infiltrate with angiocentric invasion.
Invasive Fungal Sinusitis (Mucormycosis):
- Differentiated by acute, fulminant course in DKA or severe neutropenia, black necrotic eschar on turbinates/palate, and broad non-septate hyphae with 90° branching.
Tertiary Syphilis (Nasal Gumma):
- Differentiated by positive treponemal/nontreponemal serologies, painless gummatous destruction, and history of untreated syphilis.

First-line (Medical & Conservative):
- Nasal hygiene: Aggressive saline nasal irrigations, humidification, and petroleum-based or antibiotic ointments (e.g., mupirocin) to minimize crusting and epistaxis.
- Eliminate offending agent: Immediate cessation of cocaine, nasal decongestants, and digital trauma.
- Targeted systemic therapy: Treat underlying autoimmune disease (e.g., glucocorticoids + rituximab/cyclophosphamide for GPA).
Second-line (Prosthetic Closure):
- Silicone septal button (obturator):
  - Indicated for symptomatic patients who are poor surgical candidates, have persistent substance abuse, or have active systemic autoimmune disease.
  - Provides immediate reduction of whistling, crusting, and bleeding.
Refractory / Definitive Surgical Repair:
- Surgical closure: Mucoperichondrial advancement flaps with interposition grafts (e.g., temporalis fascia, autologous cartilage).
- Indications: Persistent severe symptoms, failed medical/prosthetic therapy.
- Prerequisites: Must be disease-free (autoimmune quiescent) and strictly cocaine-free for at least 6–12 months prior to surgery to prevent flap necrosis.

Saddle-nose deformity (loss of anterior dorsal septal cartilage support).
Recurrent life-threatening epistaxis from exposed, friable mucosal margins.
Chronic atrophic rhinitis with secondary recalcitrant bacterial colonization (S. aureus, Klebsiella ozaenae).
Complete nasal airway obstruction secondary to large crust accumulation and structural collapse.

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