Definition: A generic term for a group of hereditary diseases characterized by hamartomas involving multiple tissues; von Hippel-Lindau disease, neurofibromatosis, Sturge-Weber syndrome, tuberous sclerosis. Patients with phacomatosis may develop pheochromacytomas.
[Van der Hoeve's coinage fr. G. phakos, mother-spot]
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Examples: glitazone, GI cocktail, etc.