Isolated Upper Extremity Posttransplant Lymphoproliferative Disorder in a Child

Figure 4

Histomorphologic and immunohistochemical analysis. (a) Relatively monotonous population of atypical lymphocytes infiltrating in adipose tissue with round to angulated nuclei, condensed nuclear chromatin, and inconspicuous nucleoli. The right side shows the same population of cells from the left in various stages of necrosis (H&E stained, formalin fixed, paraffin embedded section, at 40x magnification). (b) Immunohistochemical stain for CD79a, a B-cell specific antigen (formalin fixed, paraffin embedded section, at 40x magnification).

(a)

(b)