Give the most probable diagnosis of a 1 year. old child of normal intelligence with features of hypotonia. On examination, there are tongue fasciculations and he keeps his body in a frog-like position –
## **Core Concept**
The question describes a 1-year-old child with normal intelligence, presenting with hypotonia, tongue fasciculations, and a characteristic "frog-like" position of the body. This clinical presentation suggests a neuromuscular disorder.
## **Why the Correct Answer is Right**
The correct answer, **Werdnig-Hoffmann disease (Spinal Muscular Atrophy Type I)**, is a severe form of spinal muscular atrophy (SMA) that presents in infancy. It is characterized by:
- Hypotonia (low muscle tone)
- Muscle weakness
- Tongue fasciculations (involuntary muscle fiber contractions)
- A "frog-like" position due to the child's inability to move or support their body
This condition results from mutations in the **SMN1 gene**, leading to degeneration of spinal motor neurons and muscle atrophy.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is blank and cannot be evaluated.
- **Option B:** This option is blank and cannot be evaluated.
- **Option D:** This option is blank and cannot be evaluated.
## **Clinical Pearl / High-Yield Fact**
A key clinical feature of Werdnig-Hoffmann disease (Spinal Muscular Atrophy Type I) is the presence of **tongue fasciculations** in a hypotonic infant, which is highly suggestive of this diagnosis. This condition leads to severe muscle weakness and wasting, typically resulting in death within the first two years of life without ventilatory support.
## **Correct Answer:** . Werdnig-Hoffmann disease