Table 2 Grouped data summarising the frequency of hippocampal abnormalities in each type of malformation of cortical development (MCD).

Type of MCD	Hippocampal atrophy (n (%))	Enlarged hippocampus (n (%))	Abnormal rotation (n (%))	Abnormal shape (n (%))	Abnormal internal architecture (n (%))	Abnormal T2/FLAIR signal (n (%))
FCD (n = 39)	5 (13)	0	1 (2.5)	2 (5)	4 (10)	4 (10)
HME (n = 5)	3 (60)	2 (40)	2 (40)	1 (20)	1 (20)	1 (20)
Ag‐P (n = 5)	0	2 (40)	0	1 (20)	0	0
SLH (n = 11)	3 (27)	1 (9)	2 (18)	2 (18)	0	0
PNH (n = 11)	6 (54.5)	0	6 (54.5)	5 (45.5)	5 (45.5)	2 (18)
BPNH (n = 12)	4 (33)	0	4 (33)	4 (33)	4 (33)	4 (33)
SCZ (n = 5)	3 (60)	0	1 (20)	3 (60)	3 (60)	1 (20)
PMG (n = 34)	7 (20.5)	0	1 (3)	2 (6)	0	0
Total (n = 122)	31 (25.5)	5 (4)	17 (14)	20 (16.5)	17 (14)	12 (10)

Two patients with HME with enlarged hippocampus also had pachygyria in the temporal lobe.

For abbreviations see table 1 footnote.