Table 2:

Age and hemisphere prevalence of HSC in 130 normal control cases

Age Group (y)	N	Cavity-Positive Finding
Age Group (y)	N	Patients with HSC (%)	Patients with Bilateral HSC (%)	Patients with Multiple HSC (%)
20–30	18	22	17	17
31–40	17	59	47	47
41–50	19	63	32	37
51–60	19	68	37	42
61–70	18	78	56	56
71–80	19	63	21	58
81–90	20	90	55	55
Total	130	64	38	42

Note:—HSC indicates hippocampal salcus residual cavity.