Erdheim-Chester Disease and Small Lymphocytic Lymphoma Collision Tumour Presenting as a Perirenal Mass

<div>Needle biopsy of perirenal lesion showing (a) collision tumor of ECD with low grade B cell lymphoma; (b) foamy histiocytes, fibrous stroma, and scattered inflammatory cells of ECD; (c) foamy histiocytes admixed with small monomorphous lymphocytes; and (d) small lymphocytic lymphoma.</div>

Case Reports in Pathology

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Figure 2: Erdheim-Chester Disease and Small Lymphocytic Lymphoma Collision Tumour Presenting as a Perirenal Mass 