Computed tomography and magnetic resonance imaging features of lipid-rich neuroendocrine tumors of the pancreas

Table 4 Comparison of qualitative computed tomography and magnetic resonance imaging parameters in lipid-rich and non-lipid-rich pancreatic neuroendocrine tumors

Qualitative variables	Lipid-rich PanNET (n = 15)	Non-lipid-rich PanNET (n = 19)	P value	κ
Tumor margin			0.6972	0.92
Sharp	12	13
Irregular	3	6
Upstream pancreatic duct dilatation			0.6722	1.00
Present	4	3
Absent	11	16
Tumor attenuation on unenhanced CT			0.1281	0.99
Low	3	1
Iso	12	17
Mildly high	0	1
High	0	0
Tumor attenuation on early phase			0.8881	0.96
Low	0	2
Iso	2	0
Mildly high	4	5
High	9	12
Tumor attenuation on portal venous phase			0.4431	0.81
Low	0	1
Iso	4	6
Mildly high	6	7
High	5	5
Tumor attenuation on delayed phase			0.3591	0.75
Low	1	1
Iso	6	12
Mildly high	5	2
High	3	4
Tumor homogeneity on early phase			1.0002	0.77
Homogenous	8	11
Heterogeneous	7	8
Signal intensity on T2-weighted image			0.7981	0.98
Lower intensity	1	4
Same intensity	3	2
Mildly higher intensity	5	5
Higher intensity	6	8
Tumor homogeneity on T2-weighted image			0.4842	0.77
Homogenous	8	13
Heterogeneous	7	6
Signal intensity on in-phase image			0.6981	0.79
Lower intensity	14	17
Same intensity	1	2
Higher intensity	0	0
Signal intensity on out-of-phase image			0.0571	0.89
Lower intensity	13	10
Same intensity	1	8
Higher intensity	1	1
Intravoxel lipid on subtraction image			0.0292	1.00
Present	4	0
Absent	11	19

¹The P value levels shown were followed by the Mann-Whitney U test;

²The P value levels shown were followed by Fisher’s exact test. PanNET: Pancreatic neuroendocrine tumor; CT: Computed tomography.