Fig. 4

Histopathological examination in the tissue biopsy of the GI tract. a, b Ulceration in the ileum. a The lesion surrounded by a dense lymphocyte infiltration around the crypts. b Most infiltrating lymphocytes were small to medium size without significant nuclear atypia. Cryptitis was found in areas as shown by the arrows. c Immunohistochemically, the lymphocytes express CD2, CD3, CD4, CD5, CD7, and CD103 and lack CD56 expression