Which statement about CCDS brain changes is true?

Which statement about CCDS brain changes is true?

• A. Neuronal loss
• B. Neurofilament preservation without loss
• C. Demyelination without neuronal loss
• D. No structural changes

Answer: (A)

Neuronal loss drives CCDS brain changes. In canine cognitive dysfunction syndrome, the brain shows degeneration with loss of neurons and synapses, especially in the hippocampus and cortical areas, along with gliosis and often beta-amyloid deposition. This neuronal loss leads to brain atrophy and cognitive decline, so the statement that neurons are lost best fits the pathology. Saying neurofilament preservation without loss would imply neurons remain intact, which contradicts the degeneration seen in CCDS. Demyelination without neuronal loss isn’t the primary feature here, since CCDS pathology centers on neuron loss and associated cortical atrophy. No structural changes would be incorrect because CCDS involves clear neurodegenerative changes in the brain.

Neuronal loss drives CCDS brain changes. In canine cognitive dysfunction syndrome, the brain shows degeneration with loss of neurons and synapses, especially in the hippocampus and cortical areas, along with gliosis and often beta-amyloid deposition. This neuronal loss leads to brain atrophy and cognitive decline, so the statement that neurons are lost best fits the pathology.

Saying neurofilament preservation without loss would imply neurons remain intact, which contradicts the degeneration seen in CCDS. Demyelination without neuronal loss isn’t the primary feature here, since CCDS pathology centers on neuron loss and associated cortical atrophy. No structural changes would be incorrect because CCDS involves clear neurodegenerative changes in the brain.