Diogenes syndrome is a behavioral disorder of the elderly. The cardinal features of this condition include extreme self-neglect, domestic squalor, and tendency to hoard excessively (syllogomania). This is associated with self-imposed isolation, refusal of help, and marked indifference or lack of awareness. Diogenes syndrome has been referred to as senile breakdown, social breakdown, senile squalor syndrome, and messy house syndrome. Read the full article about this geriatric condition here>>. You might also like this article from Tampi and colleagues about behavioral and psychological symptoms of dementia.