Histological findings (Case 3). (A) Diffuse infiltration, high-grade pleomorphic T-cell lymphomas of medium-sized cell predominance with numerous histiocytes showing a “starry-sky” pattern (hematoxylin-eosin, original magnification × 660). (B) The cells exhibit round or oval irregular nuclei with marked clumped chromatin and one distinct nucleoli (hematoxylin-eosin, original magnification × 1,320).