Fig. 2
From: B cell-rich non-neoplastic sentinel lesion preceding primary central nervous system lymphoma
Hematoxylin and eosin (H & E) features of both biopsies. In the first biopsy of the right basal ganglia lesion (a,e), abundant mature-appearing lymphocytes were present in a mostly perivascular distribution. In the second biopsy of the left middle cerebellar peduncle lesion (f-j), there were sheets of neoplastic cells with large nuclei and numerous mitoses (j, arrowheads). Scale bar = 2 mm in a & f, 200 μm in b-d and g-i, and 50 μm in e & j