Focal cortical dysplasia (type I)
Absent episodes with limb jerking (infantile spasms). Possible arrested development.
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Focal swelling of left temporal lobe. Gyriform low T1w/high T2w signal, predominantly in the subcortical white matter with blurring of GM/WM junction. Remainder of parenchyma normal, with normal mesial temporal lobe appearances. Normal CSF configuration. No abnormal restricted diffusion. No contrast enhancement or SWI abnormality.
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Signal abnormality in the left temporal lobe without associated positive or negative mass effect. Likely focal cortical dysplasia (Blumcke type I), although a low grade DNET remains in the differential list.