Moures sign is seen in
**Question:** Moures sign is seen in
A. Corneal ulcer
B. Pneumonia
C. Peripheral neuropathy
D. Hypothyroidism
**Core Concept:** Moures sign is a clinical sign observed in patients with certain neurological disorders. It is named after the Greek neurologist, Dimitrios Moures, who first described it. This sign is primarily associated with the involvement of the dorsal columns of the spinal cord and the posterior columns of the brain. The dorsal columns are responsible for processing proprioception (awareness of body position and movement), vibration (the sensation of feeling an object's vibration), and touch. The posterior columns are involved in processing spatial orientation and balance.
**Why the Correct Answer is Right:** Moures sign is typically observed in patients with lesions affecting the posterior columns and/or the corticospinal tracts. The correct answer, D. Hypothyroidism, is incorrect because it is a systemic hormonal disorder and does not directly involve the posterior columns or the corticospinal tracts.
**Why Each Wrong Option is Incorrect:**
A. Corneal ulcer (Corneal ulcers are usually associated with pain and inflammation, but they do not cause the specific neurological deficits associated with Moures sign.)
B. Pneumonia (Pneumonia is an infection that primarily affects the lungs and does not typically involve the posterior columns or corticospinal tracts.)
C. Peripheral neuropathy (Peripheral neuropathy can affect various nerves throughout the body, but it is not specific to the posterior columns or corticospinal tracts.)
**Clinical Pearl:** Moures sign is a valuable clinical clue for diagnosing certain neurological disorders affecting the posterior columns and corticospinal tracts, such as multiple sclerosis, tabes dorsolateralis, or cervical spinal cord lesions. Recognizing this sign can lead to prompt diagnosis and appropriate management of these conditions.
**Correct Answer:** C. Peripheral neuropathy (Tabes dorsolateralis)
**Why Tabes dorsolateralis is Right:** Tabes dorsolateralis, also known as syphilis-associated peripheral neuropathy, is a specific type of peripheral neuropathy caused by the syphilis infection. In tabes dorsolateralis, the posterior columns and corticospinal tracts are affected, leading to the clinical features of Moures sign. This condition is characterized by the presence of the following signs:
1. **Hallucinations (visual or auditory):** Patients may experience vivid, distorted, and persistent hallucinations, particularly visual or auditory in nature. Hallucinations in tabes dorsolateralis are due to the involvement of the posterior columns and corticospinal tracts that process sensory and motor functions, respectively.
2. **Distortion of proprioception and vibration sense:** These symptoms are caused by the disruption of the posterior columns, which are responsible for processing proprioception and vibration sense.
3. **Ataxia:** The ataxia results from the involvement of the corticospinal tracts that control voluntary movements.
4. **Sensory loss:** This is due to the