Table 3.

Characteristics of growing and non‐growing thymic cysts

Variable	Subcategory	Growing (n = 13)	Non‐growing (n = 43)
Age (years)†		59 ± 10	54 ± 10
Gender (M:F)		3:10	25:18
Attenuation (HU)† , ‡	Non‐enhanced	22.3 ± 17.7	40.2 ± 12.6
	Enhanced	15.4 ± 11.8	44.8 ± 22.2
Average diameter (mm)§		11.8 (7.2, 22.9)	13.7 (8.9, 18.5)
Diameter ratio† , ¶		0.70 ± 0.16	0.69 ± 0.17
Former or current smoker††		2 (15.4)	15 (34.9)
Past cancer history		1 (7.7)	6 (14.0)
Follow‐up interval (days)§		479 (245, 1611)	153 (97, 597)

^† Data are mean ± standard deviation.

^‡ Attenuation data was not available in 21 patients for non‐enhanced computed tomography (CT) and 34 patients for enhanced CT because the lesions in these patients were too small to place regions‐of‐interest appropriately.

^§ Data are medians (with interquartile range in parentheses).

^¶ The ratio of the maximum perpendicular diameter to the longest diameter.

^†† Smoking history was not obtained in six patients. Unless otherwise specified, data are numbers of patients (% in parentheses).

HU, Hounsfield units.