Computed tomography angiographic study of surgical anatomy of thyroid arteries: Clinical implications in neck dissection

Table 1 Comparison between the origin of superior thyroid arteries on right and left side (n = 105), n (%)

Origin of superior thyroid artery	Category			Chi-squared test
	Right	Left	Total	χ2	P value
Bifurcation of common carotid artery	7 (6.7)	23 (21.9)	30 (14.3)	10.756	0.005
Common carotid artery	8 (7.6)	10 (9.5)	18 (8.6)
External carotid artery	90 (85.7)	72 (68.6)	162 (77.1)
Total	105 (100.0)	105 (100.0)	210 (100.0)

Table 2 Comparison between the origin of inferior thyroid arteries on right and left side (n = 105), n (%)

Origin of inferior thyroid artery	Category			Fisher's exact test
	Right	Left	Total	χ2	P value
Subclavian artery	1 (1.0)	6 (5.7)	7 (3.3)	3.696	0.119
Thyrocervical trunk	103 (98.1)	98 (93.3)	201 (95.7)
Vertebral artery	1 (1.0)	1 (1.0)	2 (1.0)
Total	105 (100.0)	105 (100.0)	210 (100.0)

Table 3 Association between gender and the origin of superior thyroid artery (n = 210), n (%)

Origin of STA	Gender			Chi-squared test
	Male	Female	Total	χ2	P value
External carotid Artery	89 (79.5)	73 (74.5)	162 (77.1)	1.409	0.494
Bifurcation of CCA	13 (11.6)	17 (17.3)	30 (14.3)
CCA	10 (8.9)	8 (8.2)	18 (8.6)
Total	112 (100.0)	98 (100.0)	210 (100.0)

CCA: Common carotid artery; STA: Superior thyroid artery.

Table 4 Association between gender and the origin of inferior thyroid artery (n = 210), n (%)

Origin of ITA	Gender			Fisher’s exact test
	Male	Female	Total	χ2	P value
Thyrocervical Trunk	107 (95.5)	94 (95.9)	201 (95.7)	2.059	0.545
SA	3 (2.7)	4 (4.1)	7 (3.3)
VA	2 (1.8)	0 (0.0)	2 (1.0)
Total	112 (100.0)	98 (100.0)	210 (100.0)

ITA: Inferior thyroid artery; SA: Subclavian artery; VA: Vertebral artery.