Table 2. The average number of detectable tumors for different types of brain metastases in group A and B by non-contrast magnetic resonance imaging (MRI) and dynamic contrast-enhanced MRI (DCE-MRI).

Group	Non-contrast MRI			DCE-MRI
	Brain parenchymal nodule		Thickening meninges	Brain parenchymal nodule	Thickening meninges
Group A	2	1		3	4
Group B	6a	2		22a	4

^aP<0.05 compared with brain parenchymal nodules in group A.