Tumors of the nasal cavity and sinuses.
1. Definition: Tumors of the nasal cavity and paranasal sinuses include benign and malignant neoplasms arising from the mucosa, bone, cartilage, glands, neuroectodermal tissue, or lymphoid structures of these regions.Because of the large, hidden spaces and nonspecific early symptoms, malignant tumors often present late with advanced local invasion.
Early symptoms mimic rhinosinusitis
👉 Unilateral symptoms are a major red flag.
2. Etiopathogenesis
Environmental and Occupational Exposures
- Wood Dust: Highly associated with Adenocarcinoma, particularly in furniture, cabinet, and boot-making industries.
- Leather and Textile Dusts: Increased risk of various carcinomas.
- Nickel and Chromium Compounds: Associated with Squamous Cell Carcinoma (SCC).
- Smoking: General risk factor for SCC.
- Formaldehyde and Solvents: Potential risk factors.
Infectious and Inflammatory Factors
- Human Papillomavirus (HPV): Strongly linked to Sinonasal Inverting Papilloma, which has a significant potential for malignant transformation (up to 10-15%).
- Chronic Inflammation: Long-standing chronic rhinosinusitis is implicated in some cases, but the link is less direct than the occupational hazards.
Pathogenesis
- Chronic mucosal irritation → metaplasia → dysplasia → carcinoma
- Viral oncogenesis (HPV → E6/E7 → p53/Rb inactivation)
- Benign tumors may transform (e.g., inverted papilloma → SCC in 5–15%)
3. Classification
Benign Sinonasal Tumors - (Locally destructive, non-metastasising)
Malignant Sinonasal Tumors - (Aggressive, invasive, metastatic potential)
4. Clinical Picture
The symptoms of sinonasal tumors are often subtle and non-specific in the early stages, mimicking chronic rhinosinusitis. This frequently leads to delayed diagnosis.
Common Initial Symptoms (Non-Specific)
- Unilateral Nasal Obstruction: Persistent and progressively worsening (the most common symptom).
- Unilateral Purulent Rhinorrhea/Post-Nasal Drip: Can be foul-smelling.
- Epistaxis: Recurrent or spontaneous nosebleeds (common in vascular tumors like JNA or malignant lesions).
"Red Flag" Symptoms (Suggestive of Malignancy/Aggression)
- Unilateral Symptoms: Persistent unilateral nasal discharge, obstruction, or polypoid mass should always raise suspicion.
- Pain/Paresthesia: Facial pain or numbness suggests perineural invasion (classic for ACC).
- Ocular Symptoms:
- Proptosis (eye bulging), Diplopia (double vision), visual changes (invasion into the orbit).
- Facial Swelling/Deformity: Expansion of the cheek (maxillary sinus) or forehead (frontal sinus).
- Dental Symptoms: Loosening of teeth, ill-fitting dentures, or palatal mass (maxillary sinus floor invasion).
- Cranial Nerve Palsies: Suggestive of skull base or cavernous sinus invasion (Sphenoid sinus tumors).
- Neck Mass: Indicates metastatic spread to cervical lymph nodes (SCC).
5. Paraclinical and Radiological Examinations
1. Clinical examination
Anterior rhinoscopy
Nasal endoscopy
- CT scan (with and without contrast): The primary imaging modality. Defines the bony anatomy, extent of destruction, and helps stage the tumor (T-stage).