Lymph node biopsy in Langerhans cell histiocytosis CD1a stain

(A) The lesion fills and expands lymph node sinuses, and the Langerhans cells are associated with eosinophils and giant cells. Hematoxylin-eosin stain.
(B) Immunostain for CD1a highlights numerous Langerhans cells. Immunochemistry with hematoxylin counterstain.