Systemic Mastocytosis Imitating Eosinophilic Enterocolitis.

Eosinophilic gastrointestinal disorders produce gastrointestinal dysfunction as eosinophils accumulate throughout gastrointestinal tissues. The majority of eosinophilic gastrointestinal disorders are a diagnosis of exclusion, and a magnitude of differentials must be considered. A history of anaphylaxis raises the suspicion that systemic mastocytosis (SM) is the foremost differential to be considered.