My parents are very careful and my condition is very detailed. Your child has two febrile convulsions and abnormal EEG, which can diagnose epilepsy. The child is characterized by convulsion of one limb and disturbance of consciousness at the same time, so it belongs to complex partial seizure, and EEG and CT support complex partial seizure. I suggest you give your child another MRI to further clarify the cause of lateral ventricle enlargement. If it does not affect children's intelligence, it can be well controlled in the future, which may be benign epilepsy. You can observe it for a period of time before taking the medicine, and you can take Chinese medicine to control it first. Children don't consider encephalitis and don't need to do lumbar puncture. If you want to use antiepileptic western medicine, you need to check your liver function.
(Dr. Xiubo from the First Affiliated Hospital of Chinese Medicine in Henan Province solemnly reminds me that it is impossible to fully understand the condition because I can't see the patient face to face. The above suggestions are for reference only. Please go to the hospital for specific diagnosis and treatment under the guidance of a doctor! )