Different histological subtypes of parotid gland tumors: CT findings and diagnostic strategy

Table 1 Clinical and radiological features of Warthin’s tumors, pleomorphic adenomas, basal cell adenoma and malignant tumors n (%)

Features	War-T	PA	BCA	KD	PCa
No. of patients	25	15	5	3	6
Age(yr)(mean ± SD)	59.9 ± 12.6	41.3 ± 11.4	58.4 ± 18.2	48 ± 15.8	51.3 ± 17.1
Sex ratio (male: female)	7.3:1	1:1.5	1:4	2:1	4:1
Smoking (yes: no)	4:1	1.5:1	0.7:1	2:1	2:1
Single: multiple lesions	1.5:1	6.5:1	5:0	0:3	6:0
Side (right: left: bilateral )	4:11:10	4:11:0	2:3:0	2:1:0	2:4:0
Location(superficial-lobe (posterior-inferior portion): deep-lobe: both)	18 (17):0:7	6 (2):3:6	3 (2):0:2	0:0:3	2 (0):0:4
Size (cm) (mean ± SD)	2.2 ± 0.91	2.1 ± 0.73	1.7 ± 0.38	1.7 ± 0.59	1.6 ± 0.32
Margin(clear: unclear)	5.3:1	1:4	4:1	3:0	1:1
Density (homogenous: heterogeneous)	1:3.2	0:15	0:5	3:0	1:1
Vessel facing sign	21 (84 )	2 (13.3)	1 (20)	0 (0)	0 (0)
Enlarged lymph nodes	19 (76)	2 (13.3)	1 (20)	3 (100)	2 (33.3)
Unenhanced-attenuation (HU)	49.0 ± 10.3	39.5 ± 7.5	35.7 ± 0.9	38.0 ± 3.0	39.8 ± 6.2

PA: Pleomorphic adenoma; BCA: Basal cell adenoma; War-T: Warthin’s tumor; PCa: Parotid carcinoma; KD: Kimura’s disease; AP: Arterial phase.

Table 2 Diagnostic efficiency of diagnostic strategy for each subtype diagnosis, the sensitivity, specificity and accuracy were evaluated

	Warthin’stumor	Pleomorphicadenoma	Basal celladenoma	Parotidcarcinoma
Sensitivity	100%	90.0%	71.4%	80.0%
Specificity	95.5%	83.3%	96.4%	89.7%
Accuracy	97.1%	85.3%	94.1%	88.2%