Berry aneurysm is associated with various connective tissue diseases. Common associations with berry aneurysm are: - Marfan syndrome - Ehlers-Danlos sydrome - coarctation of aorta - polycystic kidney - neurofibromatosis - alpha-1 antitrypsin deficiency - fibromuscular dysplasia - thoracic aortic aneurysm - abdominal aortic aneurysm Reference: https://radiopaedia.org/articles/saccular-cerebral-aneurysm Image via: https://www.urmc.rochester.edu/libraries/courses/neuroslides/lab1b/slide044.cfm