ALK positive anaplastic large cell lymphoma, classical variant

The lymphoma cells are large and anaplastic. Hallmark cells with horseshoe-shaped nuclei and perinuclear hofs are present (arrows). Hematoxylin-eosin stain.

Reproduced with permission from: Ioachim HL, Medeiros LJ. Ioachim’s Lymph Node Pathology, 4th ed, Lippincott Williams & Wilkins, Philadelphia 2009. Copyright © 2009 Lippincott Williams & Wilkins. www.lww.com.

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