Focal Cortical Dysplasia Type 3

**Semantic type:** Finding

**Definition:** Focal cortical dysplasia characterized by different cortical dyslamination and cytological abnormalities with the main lesions located in the same area. It includes the following: type IIIa with architectural distortion of cortical layer in temporal lobe with hippocampal atrophy; type IIIb with architectural distortion of cortical layer adjacent to glial or glioneuronal tumor; type IIIc with architectural distortion of cortical layer adjacent to vascular malformation; and type IIId with architectural distortion of cortical layer adjacent to other lesions acquired in early childhood (e.g., trauma, ischemic event, and encephalitis).

**Synonyms:** - FCD3 - FCDIII - Focal Cortical Dysplasia Type III