1.

腮腺肿物PI-RADS诊断结果与影像学征象

Correlations between PI-RADS grades of the parotid gland neoplasms and radiologic signs

Items	PI-RADS 2	PI-RADS 3	PI-RADS 3b	PI-RADS 4	PI-RADS 5	PI-RADS 6	Benign	Malignancy
PI-RADS, Parotid Imaging Reporting and Data System. The numbers of neoplasms were calculated here.
Size
Small (<2.0 cm)	30	82	7	7	2	0	118	10
Medium (2.0-3.0 cm)	158	453	4	49	14	1	624	55
Large (>3.0 cm)	56	102	1	20	14	3	163	33
Single/multiple
Single on one side	139	584	0	62	19	3	730	77
Multiple on one side	33	25	5	11	9	1	66	18
Multiple on two sides	72	28	7	3	2	0	109	3
Boundary
Absolutely clear	153	153	0	3	0	0	309	0
Majorly clear	68	261	2	21	4	0	345	11
Partially ill-defined	17	182	1	26	3	1	210	20
Majorly ill-defined	6	38	7	18	8	3	37	43
Ill-defined	0	3	2	8	15	0	4	24
Shape
Round	54	269	5	21	7	0	334	22
Oval	154	162	3	13	3	0	322	13
Scalloped	31	182	2	27	6	2	222	28
Irregular	5	24	2	15	14	2	27	35
Dominant density on plain CT
Fat	7	1	0	0	0	0	8	0
Liquid	30	59	0	4	12	0	91	2
Soft-tissue (partial fluid)	66	239	1	36	18	3	311	46
Soft-tissue	141	338	11	36	0	1	495	50
Enhancement degree on first enhanced phase
No significant	25	42	0	3	0	0	68	2
Slightly	10	122	0	12	4	0	140	8
Medium	29	203	5	32	13	1	236	47
Obvious	89	114	7	21	11	3	217	28
Significant	67	53	0	5	1	0	119	7
Enhancement pattern
Gradual	20	294	5	30	11	1	333	28
Fast in-out	124	128	1	23	7	2	254	31
Basically no enhancement	4	4	0	2	1	0	8	3
Gradual in-out	9	51	2	10	2	0	61	13
Enhancement distribution
Membrane enhancement	5	34	0	7	0	0	40	6
Even	152	182	12	24	15	1	346	36
Uneven to even	17	198	0	21	5	1	223	20
Uneven	14	84	0	17	8	2	99	26
No enhancement	32	36	0	4	0	0	72	0
Calcification
No	239	602	12	59	26	4	861	81
Small granular or capsule	5	31	0	10	1	0	38	9
Large irregular	0	4	0	7	3	0	6	8
Cystic percentage
0	177	488	12	49	26	2	683	71
≤25%	19	53	0	10	2	2	72	14
>25%, ≤50%	7	17	0	6	2	0	23	9
>50%, ≤75%	5	33	0	5	0	0	40	3
>75%	36	46	0	6	0	0	87	1
Adjacent structure destruction
No	237	609	7	64	16	3	867	69
Move	5	19	0	5	0	0	26	3
Poor boundary	2	8	5	6	9	0	12	18
Significant	0	1	0	1	5	1	0	8