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Dysmorphic neurons in patients with temporal lobe epilepsy

2006; Elsevier BV; Volume: 1072; Issue: 1 Linguagem: Inglês

10.1016/j.brainres.2005.10.088

1872-6240

Alexandre Valotta da Silva, Jean‐Christophe Houzel, Elza Márcia Targas Yacubian, Henrique Carrete, Américo Ceiki Sakamoto, Margareth Rose Priel, Heloise Helena Martins, Ivanilson Alves de Oliveira, Eliana Garzón, João Norberto Stávale, Ricardo da Silva Centeno, Hélio Rubens Machado, Ésper A. Cavalheiro,

Genetics and Neurodevelopmental Disorders

We studied morphologic characteristics of dysmorphic neurons in the hippocampus of seven patients with medically intractable TLE and compare histological, clinical, and imaging features with ten TLE patients with classical hippocampal sclerosis without abnormal cells. Such dysmorphic neurons were observed in the hilus of the dentate gyrus and were characterized by giant or misshapen cells with abnormal cytoskeletal structure and atypical dendritic processes that resembled the dysmorphic neurons from cortical dysplasias. Specimens with dysmorphic cells also contained other cytoarchitectural abnormalities including bilamination of the dentate granular cell layer (four out seven cases), and the presence of Cajal-Retzius cells in the dentate gyrus or Ammon's horn (five out seven cases). There were no statistically significant differences regarding the age at onset, duration of epilepsy, and hippocampal asymmetry ratio between patients with or without dysmorphic cells. Nevertheless, it is interesting to note that a higher proportion of patients with dysmorphic neurons continued to present auras after surgery, when compared with patients without those cells.