In our case, not only histological examination of lymph node demonstrated a morphological characteristic of AITL, but also the presence of T-cell linage with aberrant CD4 and CD10 expression identified in neoplastic cells by immunohistochemical staining which also strongly supported a diagnosis of AITL at initial lymph node biopsy. Here, CD4 is linked to angioimmunoblastic T-cell lymphoma.