Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Mastocytic enterocolitis ?
    ### Response:
    Mastocytic enterocolitis is a term describing the condition of chronic, intractable diarrhea in people with normal colon or duodenum biopsy results, but with an increased number of mast cells in the colonic mucosa (the innermost layer of the colon). The increase in mast cells is not associated with systemic or cutaneous mastocytosis.
    