Colpocephaly, a cause of hydrocephalus, is characterized by disproportionately enlarged occipital horns of the lateral ventricles. It is rarely seen in the older adults. Few cases were reported as colpocephaly in elderly individuals in the literature. However, it has not been reported as idiopathic normal pressure hydrocephalus-like clinical presentation in older adults. To the best of our knowledge, the co-existence of colpocephaly and Alzheimer's disease has not been reported previously. In these respects, it is the first case in the literature.