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A female with 46,X,i(Ya) in all cells and a survey of previous cases of isochromosome Yq is presented.

A 26-year-old woman simultaneously developed chronic seronegative non-destructive polyarthritis and chronic watery diarrhoea. Biopsies from the colorectal mucosa showed a thickened subepithelial collagen layer consistent with collagenous colitis. The combination of these conditions has not, to our knowledge, been described previously. On the basis of only one patient it is too early to determine whether or not this case represents a new type of enteropathic arthritis.