Extensively crushed fragments of fibrofatty tissue diffusely infiltrated by a malignant lymphoid neoplasm composed of large atypical lymphoid cells with hyperchromatic nuclei, conspicuous nucleoli, scant to moderate cytoplasm, and frequent mitotic figures.
Immunohistochemical studies performed with appropriate positive and negative controls: tumor cells show strong diffuse membranous positivity for CD20 and are negative for CD3, confirming B-cell lineage. The Ki-67 proliferation index is approximately 25%.
Referred block for immunostaining of incision biopsy from bilateral neck mass.
Received one paraffin block and one H&E slide, number coded 1104-2026, for Immunohistochemistry.
Referred paraffin block, incisional biopsy from bilateral neck mass: