Table 3 Portal of entry in relation to microbial findings, location and source of brain abscess

Microbe

Streptococcus species

19

16

1

19

55

Staphylococci

4

5

5

2

16

Gram-negative bacteria

5

1

1

1

8

Anaerobic bacteria

6

3

2

3

14

Nocardia

1

1

0

0

2

Other

1

1

0

2

4

Negative culture

5

3

1

5

14

Abscess Location

Frontal

15

8

6

8

37

Parietal

5

11

3

8

27

Temporal

8

4

0

2

14

Occipital

3

3

0

3

9

Pontine

0

3

0

0

3

Cerebellar

5

0

0

3

8

Basal ganglia

1

1

0

2

4

Multiple abscesses

3

11

3

4

21

Source of abscess

Sinusitis

13

13

Dental

15

15

Otogenic

9

9

Lung

9

9

Endocarditis/congenital heart disease

4

4

Abdominal/urinary infection

4

4

Other

12

11

Postneurosurgical/trauma

9

9

Unknown

27

27