Table 1 Patients characteristics

Patients (female/male)

23;3

Karnofsky Performance Scale (median/range) [%]

95 (70-100)

Age (median/range) [years]

60 (28-82)

Tumor site

   Olfactorius nerve

5

   Optic nerve sheath

1

   Sphenoidal

4

   Cavernous sinus

2

   Petroclival/clival

5

   Frontoparietal/-basal

2

   Sphenoorbital

2

   Parasagittal/falx

3

   Infratentoriell

1

   Convexity

1

Surgery/biopsy

19

   resection for 1/2/3 times

13;5;1

Histology/WHO grading

   WHO I

14

   WHO II (atypical meningioma)

4

   Tissue lost

1

   Unknown (diagnosis based on MRI, CT)

7

Postoperative period until initiation of radiation (median/range) [months]

56.1 (3-249)