Tumor cells show:
CD20 and LCA: Diffusely positive
CK, CD3, Synaptophysin and HMB45: Negative.
Ki-67 Labeled about 30% of tumor cells in hot spots.
Immunostaining of biopsy from rectal mass, previously diagnosed as malignant undifferentiated large round cell tumor.
Section immunostained for CD20, CD3, CK, Synaptophysin, HMB45, CD43 and Ki-67.
Rectal mass, biopsy, immunostaining:
Confirmatory of diffuse large B-Cell non-Hodgkin's lymphoma.