Light microscopic examination of recurrent tumor. Low-power magnification (×50) show that recurrent tumor cells formed follicular colonization in the germinal centers throughout the tumor (A). High-power magnification (×630) show centrocyte-like cells and plasmacytoid differentiation in the recurrent MALT lymphoma. Plasmacytoid differentiation was more prevalent in the recurrent tumor than in the primary tumor (B).
Tanaka et al. Diagnostic Pathology 2011 6:82 doi:10.1186/1746-1596-6-82