Figure 5From: Bronchus-associated lymphoid tissue lymphoma stage IV with subsequent histologic transformation to an aggressive lymphoma: A case report Histology of pulmonary lesion on repeat biopsy in 2011. There is an increased large cell population, and the proliferation index is elevated, suggesting transformation to diffuse large B-cell lymphoma (hematoxylin and eosin stain; magnification 60×).Back to article page