TABLE 1.

CT Findings by Type of Primary Salivary Gland–Type Lung Tumor

	Tumor Type
	ACC		MEC and EMEC
CT Feature	No. of Patients	% of Patients	No. of Patients	% of Patients	Total No. of Patients	p
Homogeneous						0.6976
No	4	50	4	50	8
Yes	13	59	9	41	22
Shape						0.2100
Circumferential thickening	4	100	0	0	4
Lobular	6	55	5	45	11
Rounded	7	47	8	53	15
Margin definition						1.0000
Poorly defined	3	50	3	50	6
Well defined	14	58	10	42	24
Largest-order airway with tumor extensiona						0.0016
1, 2	16	76	5	24	21
3, 4, 5	1	11	8	89	9
Infiltration of surrounding fat						0.1961
No	12	50	12	50	24
Yes	5	83	1	17	6
Amount of tumor abutting adjacent mediastinal vessel						0.4621
<50%	7	47	8	53	15
≥50%	10	67	5	33	15
Pleural effusion						1.0000
No	15	56	12	44	27
Yes	2	67	1	33	3
Lymphadenopathy						0.6908
No	11	52	10	48	21
Yes	6	67	3	33	9
Suspected metastases						0.6725
No	13	54	11	46	24
Yes	4	67	2	33	6

Note—Of these features, only central airway (trachea or main bronchi) involvement was more commonly associated with ACC than with MEC and EMEC. ACC = adenoid cystic carcinoma, MEC = mucoepidermoid carcinoma, EMEC = epithelial-myoepithelial carcinoma.

^aAirway order: 1, trachea; 2, main bronchi; 3, lobar bronchi; 4, segmental bronchi; 5, subsegmental bronchi.