The MOST common epilepsy syndrome is

Correct Answer: A

Rationale: Benign Rolandic epilepsy is the most common childhood epilepsy syndrome, per ILAE, affecting ~15% of cases, with focal seizurand normal development. Juvenile myoclonic is adolescent; infantile spasms and Lennox-Gastaut severe, rare; Landau-Kleffner language-focused. Rolandics prevalence makes A the correct answer.

Correct Answer: C

Rationale: Agenesis of the corpus callosum can cause secondary microcephaly, per neurology, from disrupted brain growth postnatally (e.g., infection). Angelman and Prader-Willi are genetic, primary; pachygyria malformation; craniosynostosis skull-driven. Acquired etiology makes C the correct answer.

Correct Answer: C

Rationale: Hereditary motor sensory neuropathy (CMT) causpcavus, per neurology, from distal muscle atrophy altering foot arches. Myasthenia and juvenile affect junctions; Duchenne proximal; CIDP variable. CMTs neuropathy makes C the correct answer.

Correct Answer: B

Rationale: Tuberous sclerosis causmegalencephaly, per neurology, from cortical tubers and growth dysregulation. Achondroplasia and osteopetrosis affect skull; fragile X microcephaly risk; hypochondroplasia skeletal. Tuberous brain enlargement make B the correct answer.

Correct Answer: A

Rationale: Neuroblastoma is the most likely cause of opsoclonus-myoclonus-ataxia, per neurology, a paraneoplastic syndrome in ~50% of cases. Medulloblastoma , ependymoma , and astrocytoma cause mass effects; glioma rare. Neuroblastomas link makes A the correct answer.