Table 2:

Patients with and without NPC in each MR imaging grade as determined using the current, modified, and plain scan MR imaging grading systems

Grading Systems	No. of Patients without NPC		No. of Patients with NPC
Grading Systems	Nodes Not Assessed	Nodes Assessed	Nodes Not Assessed	Nodes Assessed
Grade 1
Current	69	–	0	–
Modified	69	69	0	0
Plain scan	79	78	0	0
Grade 2
Current	174	–	1	–
Modified	174	170	1	1
Plain scan	147	146	2	1
Grade 3
Current	132	–	47	–
Modified	109	104	13	7
Plain scan	112	107	15	8
Grade 4
Current	8	–	335	–
Modified	28	26	91	26
Plain scan	42	38	123	32
Grade 5
Current	–	–	–	–
Modified	3	14	278	349
Plain scan	3	14	243	342

Note:—– indicates not applicable; NPC, nasopharyngeal carcinoma.