Cronkhite syndrome - Canada was described by American doctors L M. Cronkhite and WJ Canada in 1955. This syndrome is a complex of congenital anomalies: generalized polyposis of the gastrointestinal tract (including the duodenum and stomach), nail atrophy, alopecia, skin hyperpigmentation, sometimes in combination with exudative enteropathy, malabsorption syndrome, hypocalcemia, potassium and magnesium.