👉 Archencephalic is a medical term used to describe certain types of brain tumors that are characterized by their involvement in the brainstem and spinal cord. These tumors can cause symptoms such as numbness, weakness, and trouble speaking or hearing. The tumor typically starts in the area where the brain connects with the spinal cord, but it may also spread throughout the brainstem. This process is known as "neural invasion." If a person has an archencephalic tumor, their symptoms might include