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Cowden syndrome is a disorder characterized by multiple noncancerous, tumor-like growths called hamartomas and an increased risk of developing certain cancers. Almost everyone with Cowden syndrome develops hamartomas.
What is von Hippel-Lindau syndrome? Von Hippel-Lindau syndrome (VHL) is a hereditary condition associated with tumors arising in multiple organs. The tumors in VHL include hemangioblastomas, which are blood vessel tumors of the brain, spinal cord, and eye. The eye tumors are also called retinal angiomas.