Tumors of the Nose and Paranasal Sinuses

Tumors of Nose & PNS - Intro & Gentle Giants

• Classification: Primarily Benign or Malignant.
• Benign Tumors ("Gentle Giants"):
  • Osteoma:
    • Most common benign PNS tumor.
    • Sites: Frontal > Ethmoid sinuses.
    • Often incidental finding; associated with Gardner's Syndrome.
  • Inverted Papilloma (Schneiderian Papilloma):
    • Origin: Lateral nasal wall (Schneiderian membrane).
    • Unilateral nasal obstruction, epistaxis.
    • Locally aggressive, high recurrence rate.
    • 
    • ⭐ > Inverted papilloma (Schneiderian papilloma) has a notable risk of malignant transformation to Squamous Cell Carcinoma (SCC), often quoted around 5-15%.
  • Fibrous Dysplasia:
    • Developmental; bone replaced by fibrous stroma.
    • "Ground-glass" appearance on CT. Painless swelling.
  • Ossifying Fibroma:
    • True benign neoplasm; encapsulated.
    • Well-demarcated radiolucency with sclerotic border on imaging.

Tumors of Nose & PNS - Malignant Monsters

• Squamous Cell Carcinoma (SCC): Most common malignant tumor. Maxillary sinus is the most frequent site.
  • Risk factors: HPV, nickel, chromium exposure.
• Adenocarcinoma: Second most common.

  ⭐ Adenocarcinoma of the ethmoid sinus has a strong association with occupational exposure to wood dust (e.g., furniture makers, carpenters).

• Adenoid Cystic Carcinoma: Known for perineural invasion, leading to pain and paresthesia. Cribriform pattern histologically. Slow growing, but high rate of late distant metastases.
• Olfactory Neuroblastoma (Esthesioneuroblastoma): Arises from olfactory epithelium in superior nasal cavity. Bimodal age peak (10-20 yrs & 50-60 yrs).
• Sinonasal Undifferentiated Carcinoma (SNUC): Highly aggressive, poor prognosis.
• Mucosal Melanoma: Rare, aggressive, poor prognosis. Often pigmented, but can be amelanotic.
• Lymphoma: Usually Non-Hodgkin Lymphoma (NHL), diffuse large B-cell type. More common in immunocompromised individuals. Presents with nasal obstruction, epistaxis, and facial swelling. Often involves Waldeyer's ring.
• Sarcomas: Rare; rhabdomyosarcoma in children, others in adults (e.g., chondrosarcoma, osteosarcoma).

Tumors of Nose & PNS - Clues & Confirmation

• Key Symptoms (Red Flags: Unilateral, Persistent):
  • Nasal: Obstruction, epistaxis, foul discharge.
  • Facial: Swelling, pain, numbness (CN V2).
  • Orbital: Proptosis, diplopia, ↓vision.
  • Aural: Unilateral Serous Otitis Media (SOM).
  • Neck: Cervical lymphadenopathy.
• Diagnostic Workup:
  • Endoscopy + Biopsy (HPE): Gold standard.
  • Imaging:
    • CT: Bone erosion, tumor extent.
    • MRI: Soft tissue, perineural/intracranial spread.
  • Staging: TNM classification.

⭐ Ohngren's line, an imaginary plane extending from the medial canthus to the angle of the mandible, is used to prognosticate maxillary sinus tumors; tumors superior-posterior to this line generally have a poorer prognosis.

Tumors of Nose & PNS - Treatment Blueprints

• General Principles:
  • Multidisciplinary team (MDT) approach is crucial.
  • Staging (TNM) dictates treatment.
  • Goal: Complete tumor removal with negative margins, preservation of function, and cosmesis.
• Benign Tumors:
  • Observation for asymptomatic, slow-growing lesions.
  • Surgical excision is curative (e.g., endoscopic sinus surgery, lateral rhinotomy).
• Malignant Tumors:
  • Surgery: Primary treatment for most.
    • Endoscopic resection for early-stage tumors.
    • Open approaches (e.g., lateral rhinotomy, midfacial degloving, craniofacial resection) for advanced tumors.
  • Radiotherapy (RT):
    • Adjuvant to surgery for high-risk features (positive margins, perineural invasion).
    • Definitive RT for unresectable tumors or poor surgical candidates.
    • Intensity-Modulated Radiation Therapy (IMRT) preferred to spare critical structures.
  • Chemotherapy (CT):
    • Neoadjuvant (induction) to shrink large tumors.
    • Adjuvant with RT (chemoradiation) for advanced stages.
    • Palliative for metastatic disease.

⭐ Craniofacial resection is the surgical procedure of choice for malignant tumors involving the anterior skull base, often requiring a multidisciplinary team (ENT, neurosurgery).

High-Yield Points - ⚡ Biggest Takeaways

• Inverted papilloma: Benign but locally aggressive, 10% SCC transformation risk; lateral nasal wall origin.
• SCC: Most common malignancy of nose/PNS; maxillary sinus most affected; nickel/chromium exposure.
• Adenocarcinoma: Strongly linked to wood dust exposure (ethmoids); intestinal-type common.
• Esthesioneuroblastoma: From olfactory neuroepithelium; bimodal age distribution; Kadish staging.
• JNA: Adolescent males; recurrent severe epistaxis, nasal obstruction; Holman-Miller sign.
• Osteoma: Most common benign tumor (frontal/ethmoid sinuses); often asymptomatic.