Imaging characteristics of orbital peripheral nerve sheath tumors: Analysis of 34 cases

Table 1 Characteristics of 34 peripheral nerve sheath tumors patients

	Schwannoma (n = 21) (%)	Neurofibroma + plexiform neurofibroma (n =13) (%)	P value
Gender			0.290
Male	12 (57.1)	5 (38.5)
Female	9 (42.9)	8 (61.5)
Age (mean ± SD, yr)	47.33 ± 3.602	41.77 ± 4.595	0.347
Clinical symptoms
Exophthalmos	14 (66.7)	9 (69.2)	1.000
Limited eye movement	11 (52.4)	7 (53.8)	0.934
Eyelid swelling	14 (66.7)	7 (53.8)	0.455
Decreased vision	4 (19.0)	1 (7.7)	0.682
Dizzy	6 (28.6)	2 (15.4)	0.642
With NF-I	0 (0.0)	4 (30.8)	0.015a

^aP < 0.05.

NF-I: Neurofibromatosis type I.

Table 2 Comparison of imaging features between schwannoma and neurofibroma

Imaging features	Schwannoma (n = 21) (%)	Neurofibroma (n = 12) (%)	Chi-square value	P value
Location (Intramuscular space)			11.933	0.000a
Yes	19 (90.5)	3 (25.0)
No	2 (9.5)	9 (75.0)
Location (extrapyramidal space)			11.933	0.000a
Yes	2 (9.5)	9 (75.0)
No	19 (90.5)	3 (25.0)
Regular morphology			0.002	0.968
Yes	16 (76.2)	10 (83.3)
No	5 (23.8)	2 (16.7)
Bone involvement			5.085	0.024a
Yes	3 (14.3)	7 (58.3)
No	18 (85.7)	5 (41.7)
Homogeneous density/signal intensity			0.000	1.000
Yes	6 (28.6)	3 (25.0)
No	15 (71.4)	9 (75.0)

^aP < 0.05.