Fig. 4.
Fig. 4. Histologic and phenotypic features of BLL. / (A) Starry-sky pattern (hematoxylin and eosin stain of paraffin section, × 400). (B) Nearly all neoplastic cells are proliferating, as demonstrated by reactivity with Ki-67 (frozen section, × 400). (C) Strong CD20 reactivity of BLL cells (frozen section, × 400). (D) Positivity for EBV detected by EBER in situ hybridization (paraffin section, × 400).

Histologic and phenotypic features of BLL.

(A) Starry-sky pattern (hematoxylin and eosin stain of paraffin section, × 400). (B) Nearly all neoplastic cells are proliferating, as demonstrated by reactivity with Ki-67 (frozen section, × 400). (C) Strong CD20 reactivity of BLL cells (frozen section, × 400). (D) Positivity for EBV detected by EBER in situ hybridization (paraffin section, × 400).

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