Conventional MR imaging findings of sinonasal tumors and tumorlike lesions

	No.	T1WIa		FS T2WIb,c			CEd
		Isointense	Mixed	Isointense	Hyperintense	Mixed	Homo	Hetero
Inflammation	14	8	6	0	6	8	1	11
Benign	19	13	6	3	2	14	2	10
Malignant	28	23	5	6	0	22	8	19

^aLesions were categorized into those with isointense or mixed signals relative to the neighboring muscles.

^bLesions were categorized into those with isointense or mixed signals relative to the cerebral cortex.

^cDifferences in distributions were significant between inflammatory and benign lesions (P = .0494), and between inflammatory and malignant lesions (P = .0004), but not between benign and malignant lesions (P = .2049) (χ² test).

^dCE MR imaging was performed in 12 inflammatory, 12 benign, and 27 malignant lesions, and the lesions were categorized as homogeneously or heterogeneously enhancing after gadolinium injection.