Infantile spasms are associated with?
**Core Concept**
Infantile spasms, also known as West syndrome, are a type of epilepsy characterized by clusters of brief, sudden contractions of the body, typically occurring in infants. This condition is often associated with underlying neurological disorders, developmental delays, or genetic mutations.
**Why the Correct Answer is Right**
Infantile spasms are strongly linked to tuberous sclerosis complex (TSC), a genetic disorder that affects multiple organ systems. The condition is caused by mutations in the TSC1 or TSC2 genes, which regulate cell growth and proliferation. The spasms are thought to be triggered by the abnormal cell growth and tumor formation in the brain, particularly in the cerebral cortex and hippocampus. The correct answer is associated with this underlying pathophysiology.
**Why Each Wrong Option is Incorrect**
* **Option A:** While infections can trigger seizures, they are not a primary cause of infantile spasms.
* **Option B:** Hypoxic-ischemic encephalopathy may lead to seizures, but it is not a direct cause of infantile spasms.
* **Option C:** Metabolic disorders can cause seizures, but they are not typically associated with infantile spasms.
**Clinical Pearl / High-Yield Fact**
Infantile spasms often present with a characteristic "salaam" or "jackknife" posture, where the infant's body arches backward with the legs straight and the arms flexed. This distinctive posture is a key clinical feature that should raise suspicion for West syndrome.
**Correct Answer: D. Tuberous sclerosis complex (TSC)**