This group served as the control group, consisting of AD patients who received no intervention.

Participants in this group will undergo the Deep Cervical Lymphaticovenous Anastomosis (DLVA) surgery.

Participants in this group will undergo the Deep Cervical Lymphaticovenous Anastomosis (DLVA) surgery.

Participants in this group will undergo the Deep Cervical Lymphaticovenous Anastomosis (DLVA) surgery.

Participants in this group will undergo the Deep Cervical Lymphaticovenous Anastomosis (DLVA) surgery.

This surgery will enhance the drainage of cerebral lymphatic fluid by surgically establishing a connection between lymphatic vessels and veins in the neck

Measured using the (Clinical Dementia Rating Scale - Sum of Boxes(CDR-SB).The CDR-SB is a quantitative tool used to assess the severity of cognitive and functional impairment across six domains: memory, orientation, judgment and problem solving, community affairs, home and hobbies, and personal care. Each domain is rated on a scale from 0 (no impairment) to 3 (severe impairment), resulting in a total CDR-SB score ranging from 0 to 18. A score of 0 indicates no dementia, scores between 0.5 and 4.0 suggest very mild cognitive impairment or mild cognitive decline, 4.5 to 9.0 corresponds to mild dementia, 9.5 to 15.5 reflects moderate dementia, and scores between 16 and 18 represent severe dementia. In general, higher CDR-SB scores reflect greater cognitive and functional impairment, while lower scores indicate better cognitive performance and daily functioning.