Predictive value of multi-slice spiral computed tomography tumor diameter and necrotic ratio for very high-risk gastrointestinal stromal tumors

Table 2 Comparison of multi-slice spiral computed tomography features between the two groups

MSCT feature	Very high-risk group (n = 35)	Non-very high-risk group (n = 123)	Statistic	P value
Growth pattern			χ2 = 15.237	< 0.001
Intraluminal/extraluminal	15 (42.9)	95 (77.2)
Mixed intra- and extraluminal	20 (57.1)	28 (22.8)
Irregular or lobulated morphology	28 (80.0)	39 (31.7)	χ2 = 26.811	< 0.001
Ill-defined margin	25 (71.4)	34 (27.6)	χ2 = 23.456	< 0.001
Heterogeneous enhancement	32 (91.4)	59 (48.0)	χ2 = 21.543	< 0.001
Marked enhancement	25 (71.4)	60 (48.8)	χ2 = 5.832	0.016
Signs of adjacent organ invasion	16 (45.7)	9 (7.3)	χ2 = 32.115	< 0.001
Distant metastasis	10 (28.6)	1 (0.8)	Fisher’s exact test	< 0.001
Maximum tumor diameter (cm)	12.1 (9.5-15.8)	4.5 (2.8-7.1)	Z = -8.245	< 0.001
NAR (%)	28.5 (18.4-42.1)	5.2 (1.5-12.8)	Z = -9.012	< 0.001

Continuous variables are presented as median and interquartile range. Categorical variables are reported as n (%). MSCT: Multi-slice spiral computed tomography; NAR: Necrotic area ratio.