|A.||Tingible body macrophage|
Ans. D. Birbeck’s granules
These are tennis racket-shaped cells seen on an electron microscopy view, pathognomonic of Langerhans cell histiocytosis. Lytic lesions, skin lesions, and short stature ( pituitary stalk involvement ) likely indicate the diagnosis of the Hand-Schuller Christian variant of LCH.
Downey cells are atypical lymphocytes seen on peripheral smears indicative of infectious mononucleosis.
Blast cells are lymphocytes with large nucleus indicative of ALL/AML
Tingible body macrophages are stainable macrophages that scavenge apoptotic lymphocytes in a germinal center of reactive/neoplastic lymph node.