Table 2 The detail demographic and clinical characteristics of these patients

Wang,Y.B., et al. [25]

2018

1

1

Left frontal lobe

51

F

Left frontal scalp swelling

12

NA

35

Hypointense

Hyperintense

Yes

NA

NA

Yongjun, L., et al. [6]

2015

9

1

Right frontal lobe

39

F

Headache, dizziness, and vomiting(8/9)

NA

Anemia(4/9)

NA

Hypointense (9/9)

Hyperintense(7/9)

Yes(9/9)

Hyperdense(6/6)

Yes(5/6)

2

Right lateral lobe

30

M

Epilepsy(3/9)

Hypointense (2/9)

3

Occipital sagittal sinus side

52

M

Vision loss(2/9)

4

Cerebellopontine angle

63

F

Hearing loss(1/9)

5

Cerebral falx

9

F

6

Sphenoid ridge

47

M

7

Right occiput

34

M

8

Left forehead

59

M

9

Left frontal temporalis lobe

54

F

Tao, X., et al. [11] (multicenter study without individual information)

2017

56

56

Frontal convexity (19)

44.6 ± 12

F(28/56)

Headache or increased intracranial hypertension (24/56)

Average 2

NA

46 ± 16.7

Isointense (34/55)

Isointense (25/55)

Homogeneous enhancement (39/55)

Isodense (11/25)

- (13/56)

Parietal convexity (10)

M(28/56)

Limb weakness (8/56)

Hypointense (21/55)

Hypointense (5/55)

Heterogeneous enhancement (16/55)

Hyperintense (10/25)

 + (21/56)

Lateral ventricle (3)

Dizziness(7/56)

Hyperintense (25/55)

Mixed density (4/25)

 +  + (8/56)

Pineal region(2)

Blurred vision (7/56)

 +  +  + (14/56)

Posterior fossa convexity (1)

Numbness (6/56)

Fourth ventricle(1)

Seizures (6/56)

Sphenoid ridge(6)

Memory loss (3/56)

Tuberculum sellae/Parasellar (5)

Diplopia(3/56)

Cerebellopontine angle (3)

Facial paralysis (3/56)

Petroclival region (3)

Hearing loss(2/56)

Foramen magnum (2)

Hyposmia (3/56)

Anterior skull base (1)

Asymptomatic(7/56)

de Almeida, G.B. and G. Januário [26]

2022

1

1

Bilateral frontoparietal lobe

57

F

Left hemiparesis

NA

Normal

70

Isointense

Hypointense

Homogeneous enhancement

Hyperdense

Yes

Wang, H., et al. [7]

2021

1

1

Skull base to C6

44

M

Complaints of limb weakness

NA

Anemia

NA

Isointense

Isointense

Homogeneous enhancement

NA

NA

Gu, K.C., et al. [27]

2020

1

1

Right frontal lobe

36

M

Headache

NA

Normal

40

Hyperintense

Hypointense

Yes

Mixed density

Yes

Study

Year

Nb

Location

Age

(years)

Gender

Cliencal symptoms

History

(months)

Peripheral blood abnormalities

Maximum diameter (mm)

TIW1

T2W2

Enhancement

CT

Edema

Li, J., et al. [28]

2021

1

1

Skull base, tentorium, sella area, and C1-6

44

M

Extremities weakness

2

NA

NA

Isointense

Isointense

Homogeneous enhancement

NA

NA

Wang, Y.B., et al. [4]

2014

1

1

Ventricle

37

F

Generalized tonic–clonic seizure

5 Hours

NA

40

Hypointense

Hyperintense

Yes

NA

Yes

Kanno, H., et al. [15]

2011

1

1

Right jugular foramen

55

F

Hoarseness and dysphasia

NA

NA

15

Isointense

Hyperintense

Yes

Mixed density,

homogeneous enhancement

NA

Yang, X., et al. [29]

2018

1

1

Lateral ventricle

47

F

Occipital-cervical region pain

6

NA

NA

Isointense

Hyperintense

Yes

NA

NA

Avninder, S., V. Gupta, and K.C. Sharma [30]

2008

1

1

The medulla and upper cervical cord mass

22

F

Headache

6

NA

35

Isointense

NA

Homogeneous enhancement

NA

NA

Majumdar, K., et al. [31]

2013

1

1

Right sphenoid rigid

50

M

Blurred vision

NA

Normal

50

NA

Hyperintense

Yes

NA

NA

Zhu, H.D., et al. [8]

2013

19

1

Left occipital lobe

20

F

NA

NA

Normal

NA

NA

Homogeneous enhancement (11/14)

 + 

2

Right frontoparietal lobe

28

F

Hyperglobulinemia/Anemia

Heterogeneous enhancement (3/14)

 +  +  + 

3

Left temporal lobe

42

M

Normal

-

4

Left frontotemporal lobe

48

F

Normal

NA

5

Right frontal falx

77

M

Normal

-

6

Right frontal lobe

46

M

Normal

 + 

7

Left occipital lobe

46

M

Normal

-

8

Right frontoparietal lobe

57

M

Normal

 + 

9

Left sphenoid ridge

58

F

Normal

 +  + 

10

Right frontal falx

79

M

Normal

-

11

Right frontal falx

63

F

Normal

 + 

12

Right frontal falx

71

M

Normal

 +  + 

13

Right frontal lobe

46

F

Normal

 +  + 

14

C1-2

25

M

Anemia

-

15

Foramen magnum to C1-4

57

F

Normal

-

16

Left cerebellum &tentorium

21

F

Anemia

-

17

Right frontoparietal lobe

40

F

Normal

 + 

18

C3-4

51

M

Normal

-

19

Left frontoparietal lobe

24

F

Normal

 +  +  + 

Fukui, K., et al. [32]

2021

1

1

C2-3

43

M

Neck pain

12

Hyperglobulinemia/Anemia

Isointense

Hyperintense

Homogeneous enhancement

NA