Microbiological Spectrum of Brain Abscess at a Tertiary Care Hospital in South India: 24-Year Data and Review

Table 1

(a) Neuroanatomical location and source of infection of brain abscess comparison between the two study groups. (b) Neuroanatomical location and source of infection of solitary brain abscess in study group II (𝑛=263). (c) Location and source of infection of multiple brain abscesses in study group II (𝑛=39).

(a)

Primary source of infection
Location	CSOM		CHD		Pulm		Trauma		Cryptogenic		Total
Group	I	II	I	II	I	II	I	II	I	II	I	II
Parietal	8	4	4	11	4	1	1	23	5	23	22	62
Frontal	4	20	2	3	—	1	—	6	2	33	8	63
Temporal	6	46	1	3	—	—	—	3	2	11	9	63
Cerebellar	4	15	—	—	—	1	—	—	—	2	4	18
Occipital	2	5	1	1	—	—	—	—	1	2	4	8
Subdural	—	1	1	—	2	—	—	—	—	—	3	1
Total	24	91	9	18	6	3	1	32	10	71	50	215

CSOM: chronic suppurative otitis media, CHD: congenital heart disease, and Pulm: pulmonary.
Group I: 1987–1993 and Group II: 1994–2010.

(b)

Primary source of infection
Location	ASOM	CSOM	PNS	CHD	Sepsis	Odont	Pulm	Trauma	Op trauma	Misc	Crypto	Total
Parietal	—	4	—	11	17	1	1	9	14	1	23	80
Frontal	—	20	6	3	4	—	1	2	4	—	33	73
Temporal	—	46	2	3	3	1	—	1	2	3	11	72
Cerebellar	1	15	—	—	1	—	1	—	—	2	2	22
Occipital	—	5	—	1	—	—	—	—	—	—	2	8
Subdural	—	1	—	—	2	—	—	—	—	—	—	3
Epidural	—	—	—	—	3	—	—	—	—	—	—	3
Thalamus	—	—	—	—	—	—	—	1	—	—	—	1
Medullary	—	—	—	—	—	—	—	—	—	—	1	1
Total	1	91	8	18	30	2	3	13	20	6	71	263

ASOM: acute suppurative otitis media, CSOM: chronic suppurative otitis media, PNS: paranasal sinusitis, CHD: congenital heart disease, Odont: odontogenic, Pulm: pulmonary, Op trauma: operative trauma, Misc: miscellaneous, and Crypto: cryptogenic.
E. hystolytica and Acanthamoeba cases not included in analysis.

(c)

Location	ASOM	CSOM	PNS	CHD	Sepsis	Odont	Pulm	Trauma	Op trauma	Misc	Crypto	Total
FP	—	5	—	1	1	—	—	3	—	—	—	10
FT	—	2	—	1	—	—	—	1	—	—	—	4
FO + SD	—	1	—	—	—	—	—	—	—	—	—	1
F + SD	—	—	—	—	1	—	—	—	—	—	—	1
PO	—	5	—	3	—	—	—	1	—	3	—	12
TP	—	5	—	—	1	—	—	3	—	—	1	10
T + SD	—	1	—	—	—	—	—	—	—	—	—	1
TOTAL	—	19	—	5	3	—	—	8	—	3	1	39

CSOM: chronic suppurative otitis media, PNS: paranasal sinusitis, CHD: congenital heart disease, Odont: odontogenic, Pulm: pulmonary, Op trauma: operative trauma, Misc: miscellaneous, Crypto: cryptogenic, FP: frontoparietal, FT: frontotemporal, FO: fronto-occipital, SD: subdural, F: frontal, PO: parieto-occipital, TP: temperoparietal, and T: temporal.