Benign retroperitoneal schwannoma presenting as colitis: A case report

Table 1 Diagnostic criteria for NF2[22]

Definite NF2
1	Bilateral vestibular schwannomas or
2	Family history of NF2 (first-degree family relative) plus
	a Unilateral vestibular schwannoma at age < 30 yr, or
	b Any two of the following: meningioma, glioma, schwannoma or juvenile posterior subcapsular lenticular opacities/juvenile cortical cataract
Presumptive or probable NF2
1	Unilateral vestibular schwannoma at age < 30 yr plus at least one of the following: meningioma, glioma, schwannoma or juvenile posterior subcapsular lenticular opacities/juvenile cortical cataract
2	Multiple meningiomas (two or more) plus
	a Unilateral vestibular schwannoma at age < 30 yr, or
	b One of the following: glioma, schwannoma or juvenile posterior subcapsular lenticular opacities/juvenile cortical cataract

Table 2 Diagnostic criteria for schwannomatosis[23]

Definite schwannomatosis
1	Two or more pathologically proved schwannomas, plus
2	Lack of radiographic evidence of vestibular schwannoma at age > 18 yr
Presumptive or probable schwannomatosis
1	Two or more pathologically proved schwannomas without symptoms of eighth nerve dysfunction at age > 30 yr or
2	Two or more pathologically proved schwannomas in an anatomically limited distribution (single limb or segment of the spine), without symptoms of eighth nerve dysfunction, at any age