TABLE 2:

Imaging features of NPCs

Patient	Imaging	Nasal Cavity	Lateral Retropharyngeal Lymphadenopathy	Neck Nodes	Mastoid Opacification	Petroclival Fissure	Skull Base/Prevertebral Muscle	Pterygopalatine Fossa	Parapharyngeal Space	Masticator Space	Carotid Encasement	Cavernous Sinus	Sphenoid Sinus
1	CT, MR	Involved	NI	Bilateral	Yes	NI	Unilateral	Unilateral	Unilateral	NI	Yes	Involved	Involved
2	CT	Posterior choana	Bilateral	Unilateral	Yes	Bilateral	Unilateral	NI	Unilateral	NI	No	NI	Involved
3	CT	NI	Unilateral	Bilateral	Yes	NI	Unilateral	NI	NI	NI	No	NI	NI
4	MR	Posterior choana	Bilateral	Unilateral	Yes	Unilateral	Unilateral	NI	Unilateral	Unilateral	No	NI	NI
5	CT	Involved	Unilateral	Unilateral	Yes	Unilateral	Unilateral	NI	Unilateral	NI	No	NI	NI
6	CT, MR	Posterior choana	Unilateral	Bilateral	Yes	Unilateral	Unilateral	NI	NI	NI	No	NI	Involved
7	CT	Posterior choana	Unilateral	Unilateral	Yes	Unilateral	Unilateral	Unilateral	NI	Unilateral	No	NI	NI
8	CT, MR	Posterior choana	Unilateral	Bilateral	Yes	NI	Unilateral	NI	Unilateral	NI	No	NI	NI
9	MR	NI	Unilateral	Bilateral	Yes	Unilateral	Unilateral	NI	Unilateral	NI	No	NI	NI
10	CT, MR	Posterior choana	Bilateral	Bilateral	Yes	Unilateral	Unilateral	NI	NI	NI	No	NI	NI
11	MR	Posterior choana	Bilateral	Bilateral	Both	Bilateral	Unilateral	NI	NI	NI	No	NI	NI

Note—NI = not involved.