A 50-year-old woman complains of clumsiness in her hands while working in the kitchen: She recently burned her hands on the stove without experiencing any pain. Neurologic examination reveals bilateral weakness of the shoulder girdles, arms, and hands as well as a loss of pain and temperature sensation covering the shoulder and upper limb in a cape-like distribution. Severe atrophy is present in the intrinsic muscles of the hands. The most likely diagnosis is:
A 50-year-old woman complains of clumsiness in her hands while working in the kitchen: She recently burned her hands on the stove without experiencing any pain. Neurologic examination reveals bilateral weakness of the shoulder girdles, arms, and hands as well as a loss of pain and temperature sensation covering the shoulder and upper limb in a cape-like distribution. Severe atrophy is present in the intrinsic muscles of the hands. The most likely diagnosis is:
💡 Explanation
## **Core Concept**
The question describes a patient with a combination of motor and sensory neurological deficits, including weakness and atrophy in the shoulder girdles, arms, and hands, along with a loss of pain and temperature sensation in a "cape-like" distribution over the shoulders and upper limbs. This pattern suggests a lesion affecting the cervical spinal cord.
## **Why the Correct Answer is Right**
The clinical presentation is highly suggestive of **syringomyelia**, a condition characterized by the formation of a fluid-filled cavity or syrinx within the spinal cord. This syrinx can expand and elongate over time, damaging the spinal cord and disrupting its function. The damage typically affects the **crossing spinothalamic tracts** (carrying pain and temperature sensation) and the **motor neurons** (leading to weakness and atrophy) in the cervical region. The "cape-like" distribution of sensory loss is classic for syringomyelia due to the involvement of the spinothalamic tracts as they cross at the level of the spinal cord.
## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, incorrect options might include diagnoses such as multiple sclerosis, amyotrophic lateral sclerosis (ALS), or peripheral neuropathy.
- **Multiple sclerosis** primarily affects the white matter of the brain and spinal cord, leading to a wide range of neurological symptoms, but it usually doesn't cause such a focal, symmetrical pattern of damage.
- **Amyotrophic lateral sclerosis (ALS)** involves progressive degeneration of motor neurons but does not typically cause sensory deficits.
- **Peripheral neuropathy** affects the peripheral nerves, leading to distal symmetrical weakness and sensory loss, not typically in a cape-like distribution.
## **Clinical Pearl / High-Yield Fact**
A key clinical feature of syringomyelia is the **dissociated sensory loss**, where there is a loss of pain and temperature sensation with preservation of other sensory modalities (like touch and proprioception). This occurs because the syrinx damages the spinothalamic tracts while sparing other sensory pathways. Early recognition of this condition is crucial because timely intervention (such as surgery) can prevent further neurological deterioration.
## **Correct Answer:** .
✓ Correct Answer: C. Syringomyelia
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