Figure 1: The microscopic feature of the second cases (haematoxylin and eosin staining). Case 2: mucosa-associated lymphoid tissue lymphoma involving the lamina propria of the urinary bladder (hematoxylin-eosin, original magnification 100). Reproduced from [4] with permission of the Editor-in-Chief of Archives of Pathology and Laboratory Medicine on behalf of the editorial team of the journal and the American Association of Pathology.