Unusual presentation of Erdheim-Chester disease in a child with acute lymphoblastic leukemia

Figure 3 A biopsy from the lesion. A: Hematoxylin and eosin stained section showing an infiltrate comprised of foamy and lipid laden histiocytes, multinucleated giant cells, lymphocytes and fibroblastic cells (200 ×); B: Immunohistochemistry with CD68 showing positivity in histiocytic cells and giant cells (200 ×).