I'm sorry, but it seems like there is a misunderstanding or confusion regarding the term "Alzheivirus." As of my understanding and knowledge, "Alzheivirus" is not a recognized term or condition in medical health. It does not cause cavities on the brain or a tooth cavity version in the brain. However, for clarification purposes, Alzheimer's disease is a well-known neurodegenerative disorder affecting the brain. It is characterized by progressive cognitive decline, memory loss, and eventually a significant impact on daily functioning. Alzheimer's disease does not cause cavities in the brain or resemble a tooth cavity. If you have any further questions or inquiries, feel free to provide additional information, and I'll be happy to assist you.