Figure 2: Immunohistochemistry of bronchoscopic biopsy of the first patient.
Panel A) Infiltration of small cellular lymphoid cell components indicating manifestation of lymphoma in hematoxylin and eosin stain.
Panel B) Anti-CD20 immunohistochemistry confirmed a highly suspicious B cell population.
Panel C) Low proliferation rate of the B cell population detected by MIB-1 immunohistochemistry.