Fig. 2
From: Tonsillar granuloma associated with hypogammaglobulinemia
Histological findings (a, b) showing granulomatous reaction in lingual tonsil with CD68 (Kp-1) positive epitheloid histiocytes by immunohistochemistry (c). Strong CD20-immunopositivity in B-lymphocytes (d). Most CD3-positive (e) T-lymphocytes showed also CD4-positivity (f)