Pitfalls in the Diagnosis of Anaplastic Large Cell Lymphoma with a Small Cell Pattern
Left axillary lymph node biopsy (original magnification ×400). Haematoxylin and eosin: (a) infiltration of the node by predominantly small lymphoid cells and occasional “hallmark” cells (circled in black), CD3 immunostain positive (b), CD8 immunostain positive (c), ALK immunostain-positive nuclear staining (d), and CD30 immunostain scattered positivity in large cells (e).
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