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Nasal Polyps & Cancer: Understanding the Rare Malignant Association

Nasal polyps are benign inflammatory growths from chronic rhinosinusitis with nasal polyps (CRSwNP). Malignant transformation is extremely rare (<1%), but certain clinical features warrant thorough investigation to rule out neoplasia.

Red Flags for Neoplasia

  • Unilateral polyps: Especially if vascular, friable, or bleeding.
  • Rapid growth or change in character.
  • Persistent unilateral symptoms: obstruction, epistaxis, pain, hyposmia.
  • Neurologic signs: facial numbness (V2), vision changes (orbital invasion), proptosis.
  • Failure to respond to maximal medical therapy (steroids, biologics) or recurrence after surgery.
  • Imaging findings: bone erosion, soft tissue invasion, heterogeneous enhancement on MRI/CT.

Malignancies That Mimic Polyps

  • Sinonasal squamous cell carcinoma.
  • Sinonasal undifferentiated carcinoma (SNUC).
  • Olfactory neuroblastoma (esthesioneuroblastoma).
  • Lymphoma, melanoma, adenocarcinoma, salivary gland tumors.
  • Inverted papilloma (benign but 10–15% malignant transformation).

Diagnostic Workup

  1. Nasal endoscopy (office-based).
  2. MRI (soft tissue, perineural spread) + CT (bone detail).
  3. Biopsy: essential for definitive diagnosis. Often requires OR for adequate sampling.
  4. Pathology: HPV, EBV, molecular markers (IDH2, NUT, SMARCB1).

Management

  • Benign polyps: Topical/intranasal steroids, biologics (dupilumab, omalizumab, mepolizumab), endoscopic sinus surgery.
  • Malignancy: Multidisciplinary tumor board. Surgery (endoscopic vs. open) + radiation ± chemotherapy. Neoadjuvant trials emerging.

Key Takeaway

Most polyps are benign. Unilateral, bleeding, painful, or treatment-resistant polyps need prompt ENT evaluation with imaging and biopsy. Early diagnosis of malignancy dramatically improves outcomes.

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