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Table 2: Age and hemisphere prevalence of HSC in 130 normal control cases
Age Group (y) N Cavity-Positive Finding
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.

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