Incidence of Hippocampal Metastases: Laterality and Implications for Unilateral Hippocampal Avoiding Whole Brain Radiotherapy

Table 2

Spatial distribution of brain metastases.

Location of metastasis	N= 260 patients
	N= 2595 metastases
Temporal – No. of patients	95 (36.5%)
Left	61 (23.5%)
Right	62 (23.9%)
Temporal – No. of metastases	310 (11.9%)
Mean/ Median/ IQR (25-75 %)	3.26/1/1-2.5
Left/Right
Mean	2.48/2.57
Median	1/1
IQR (25-75 %)	1-2/1-2
Occipital – No. of patients	101 (38.9%)
Left	73 (28.1%)
Right	57 (21.9%)
Occipital – No. of metastases	288 (11.1%)
Mean/ Median/ IQR (25-75%)	2.85/1/1-2
Left/Right
Mean	1.95/2.56
Median	1/1
IQR (25-75 %)	1-2/1-3
Parietal – No. of patients	128 (49.2%)
Left	85 (32.7%)
Right	83 (31.9%)
Parietal – No. of metastases	397 (15.3%)
Mean/ Median/ IQR (25-75 %)	3.10/1/1-2
Left/Right
Mean	2.55/2.17
Median	1/1
IQR (25-75 %)	1-2/1-2
Frontal – No. of patients	154 (59.2%)
Left	121 (46.5%)
Right	98 (37.7%)
Frontal – No. of metastases	962 (37.1%)
Mean/ Median/ IQR (25-75 %)	6.25/2/1-4
Left/Right
Mean	4.02/4.86
Median	1/2
IQR (25-75 %)	1-2/1-4
Other locations – No. of patients	29 (11.2%)
Other locations – No. of metastases	638 (24.6%)

Abbreviations: No.- number, MTS- metastasis, IQR-interquartile range