A 28-year-old male presents with involuntary jerky movements of the face and limbs, along with noticeable personality changes and increasing forgetfulness. An MRI of the brain is shown. What is the most likely diagnosis?

1. A

   Wilson's disease

2. B

   Sydenham's chorea

3. C

   Prion disease

4. D

   Huntington's disease

Appeared in: INI-CET EXAM -2025

Explanation

• Huntington's disease is an autosomal dominant neurodegenerative disorder characterized by a classic triad of symptoms: motor, cognitive, and psychiatric.
• The patient's involuntary jerky movements are a form of chorea, which is the hallmark motor symptom of Huntington's disease.
• The personality changes and increasing forgetfulness represent the psychiatric and cognitive decline that are core features of the condition.
• The typical age of onset is between 20 and 65 years, making the 28-year-old patient's presentation consistent with this diagnosis.
• Structural brain imaging, such as an MRI, characteristically shows atrophy of the caudate nucleus and putamen in patients with Huntington's disease.

Why Other Options Were Wrong

• Option A: Wilson's disease is a disorder of copper metabolism. While it can present with neurological and psychiatric symptoms in young adults, it is typically diagnosed by finding Kayser-Fleischer rings in the cornea and abnormal serum ceruloplasmin and copper levels, none of which are mentioned.
• Option B: Sydenham's chorea is a major manifestation of acute rheumatic fever, which typically occurs in children and adolescents following a Group A streptococcal infection. It is extremely rare to have a first presentation in a 28-year-old.
• Option C: Prion diseases, such as Creutzfeldt-Jakob disease (CJD), are characterized by a much more rapid and fulminant course, with patients typically progressing from symptom onset to death in under a year. The scenario implies a more gradual progression typical of Huntington's.

Related Visual

• Visual 1: MRI Comparison - An axial T1-weighted MRI showing a normal brain beside one from a patient with Huntington's disease, highlighting the prominent atrophy of the caudate nucleus (loss of the normal bulge into the lateral ventricles).
• Visual 2: Diagram - A pedigree chart illustrating the autosomal dominant inheritance pattern of Huntington's disease, showing a 50% chance of an affected parent passing the gene to each child.

Clinical Relevance

• Nursing practice connection: Use the key finding related to Differential diagnosis of neurodegenerative disorders in a young adult presenting with chorea and cognitive decline to guide bedside assessment, documentation, and the next nursing action.
• Nursing care for patients with Huntington's disease is complex and focuses on safety, symptom management, and psychosocial support. Key priorities include preventing falls due to chorea and ataxia, and preventing aspiration due to dysphagia.
• Nurses play a vital role in providing emotional support and education to both the patient and their family, addressing the profound psychological impact of the diagnosis and its genetic implications.
• Genetic counseling is a critical component of care. Since it is an autosomal dominant disorder, the patient's family members, including siblings and children, have a significant risk of inheriting the disease.

How to Approach the Question

• First, analyze the patient's demographics: a 28-year-old male. This age helps narrow down the possibilities, ruling out conditions that are primarily pediatric or geriatric.
• Next, identify the key clinical features presented in the stem. Break them down into categories: motor (involuntary jerky movements), cognitive (forgetfulness), and psychiatric (personality changes).
• Recognize this combination as the classic triad for a specific neurodegenerative disorder.
• Evaluate each option against this clinical triad. Consider the typical age of onset, progression, and key features of each disease.
• Huntington's disease perfectly matches the triad of chorea, dementia, and psychiatric disturbances in a young to middle-aged adult.
• Use the process of elimination for the other options: Sydenham's is a pediatric condition, Prion disease is much more rapid, and Wilson's disease has other specific diagnostic markers not mentioned.

Concept Tested & Keywords

• Concept Tested: Differential diagnosis of neurodegenerative disorders in a young adult presenting with chorea and cognitive decline.
• Stem keywords: involuntary jerky movements, personality changes, forgetfulness, 28-year-old male, MRI
• Lead-in keywords: most likely diagnosis
• Clinical cues: The combination of motor (jerky movements), cognitive (forgetfulness), and psychiatric (personality changes) symptoms in a young adult is a classic triad for Huntington's disease.

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