Representative patterns of CD30 expression in non-ALCL T-cell lymphomas. (A-C) Variable expression patterns of CD30 in PTCL-NOS. Strong uniform CD30 expression in PTCL-NOS (A), weak CD30 expression in PTCL-NOS (B), and partial CD30 expression in PTCL-NOS (C). (D-E) CD30 expression in AITL. (D) CD30 is expressed in large immunoblasts and in smaller neoplastic cells in AITL. (E) Weak CD30 expression in AITL. (F) Transformed mycosis fungoides with strong diffuse CD30 expression. (G-H) Patterns of expression of CD30 in ENKTL. Moderate partial CD30 expression in ENKTL (G) and diffuse weak CD30 expression in ENKTL (H). Original magnification ×50 for all panels.