Table 2 Incidence of tumor invasion into anatomic sites surrounding nasopharynx
Anatomic site | No. of patients (%) | Anatomic site | No. of patients (%) |
|---|---|---|---|
Levator veli muscle | 111 (63.1) | Cavernous sinus | 11 (6.3) |
Tensor veli palatini muscle | 98 (55.7) | Meninges | 10 (5.7) |
Parapharyngeal space | 88 (50.0) | Nasal cavity | 10 (5.7) |
Prevertebral muscle | 77 (43.7) | Sphenoidal sinus | 9 (5.1) |
Foramen lacerum | 55 (31.2) | Inferior orbital fissure | 8 (4.5) |
Petrous apex | 51 (29.0) | Parotid gland | 5 (2.8) |
Basis of sphenoid bone | 43 (24.4) | Hypoglossal canal | 3 (1.7) |
Clivus | 45 (25.6) | Maxillary sinus | 2 (1.1) |
Pterygoid process | 34 (19.3) | Infratemporal fossa | 2 (1.1) |
Medial pterygoid muscle | 32 (18.2) | Orbital apex | 2 (1.1) |
Pterygopalatine fossa | 20 (11.4) | Jugular foramen | 1 (0.6) |
Foramen ovale | 18 (10.2) | Cervical vertebrae | 1 (0.6) |
Oropharynx | 16 (9.1) | Ethmoid sinus | 1 (0.6) |
Lateral pterygoid muscle | 15 (8.5) |