Table 2:

Classification of hippocampal atrophy in 101 patients with temporal lobe epilepsy

Patients with right-sided seizure onset (n = 48)
    No evidence of HA10 (21%)
    Unilateral HA34 (71%)
        Right HA31 (65%)
        Left HA1 (2%)
        Only asymmetry (right ≪ left)2 (4%)
    Bilateral HA4 (8%)
Patients with left-sided seizure onset (n = 53)
    No evidence of HA9 (17%)
    Unilateral HA43 (81%)
        Right HA0 (0%)
        Left HA38 (72%)
        Only asymmetry (right ≪ left)5 (9%)
    Bilateral HA1 (2%)
  • Note:—Laterality of seizure onset was established using electroencephalogram recordings or invasive foramen ovale. HA indicates hippocampal atrophy.