Question

Loss of pain/temperature sensation on ipsilateral face & C/L body due to thrombosis in

• A. PICA
• B. Posterior cerebellar artery
• C. Superior cerebellar artery
• D. None of the above

Answer 1

The Correct Option is A

The issue described is the loss of pain and temperature sensation on the ipsilateral (same side) face and contralateral (opposite side) body. This is characteristic of a lateral medullary syndrome, also known as Wallenberg syndrome, which occurs due to occlusion of the Posterior Inferior Cerebellar Artery (PICA).

The PICA supplies areas of the medulla and cerebellum. When PICA is occluded, it affects the lateral part of the medulla where important sensory pathways are located. Specifically, the tract for pain and temperature sensation on the ipsilateral face (such as the spinal trigeminal nucleus and tract) and the spinothalamic tract responsible for similar sensations on the contralateral body are involved.

Here's a brief explanation of the pathways:

• Ipsilateral Face: The spinal trigeminal tract and nucleus are responsible for sensory input from the face, particularly for pain and temperature. Damage here causes loss of sensation on the same side of the face.
• Contralateral Body: The spinothalamic tract carries pain and temperature sensations from the opposite side of the body. Occlusion affects the portion of this tract in the medulla, leading to loss of these sensations on the opposite side of the body.

Based on this information, the correct answer is PICA.