Anatomy Haematology dfb906a8 In langerhans cell hystiocytosis,the characteristic abnormality seen on microscopy is: A Birbecks granules B Foamy macrophages C Giant cells D Plasma cells High-Yield Explanation Langerhans cell histiocytosis is characterised by the presence of Birbeck granules in the cytoplasm.(ref Robbins 9th/622)