Lafora’s disease presents with –
**Core Concept**
Lafora's disease is a rare, inherited disorder characterized by the accumulation of abnormal, polyglucosan-filled inclusions in the cytoplasm of neurons, leading to progressive myoclonus epilepsy (PME) and eventual loss of motor function. This condition is caused by mutations in the EPM2A or NHLRC1 genes, affecting the function of laforin, a protein involved in glycogen metabolism.
**Why the Correct Answer is Right**
Lafora's disease is a type of PME that primarily affects children and young adults, with symptoms including myoclonic seizures, ataxia, and decline in cognitive function. The hallmark histopathological feature of Lafora's disease is the presence of Lafora bodies, which are rounded, eosinophilic inclusions composed of polyglucosan, a polysaccharide derived from glycogen. These inclusions disrupt normal neuronal function, leading to the characteristic seizures and motor dysfunction.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Lafora's disease is primarily characterized by myoclonic seizures and ataxia, rather than the more generalized tonic-clonic seizures seen in other forms of epilepsy.
**Option B:** This option is incorrect because Lafora's disease is a distinct clinical entity, separate from other forms of progressive myoclonus epilepsy, such as Unverricht-Lundborg disease.
**Option C:** This option is incorrect because Lafora's disease is typically diagnosed in early childhood, rather than in middle age.
**Clinical Pearl / High-Yield Fact**
Lafora's disease is a rare but important cause of progressive myoclonus epilepsy in children and young adults, and early recognition and diagnosis are essential for optimal management and treatment.
**Correct Answer:** B.