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430 SectIon III Hematology and oncology ` hematology and oncology—Pathology Hematology and oncology ` hematology and oncology—Pathology

Non‑Hodgkin lymphoma
tyPe occURS In genetIcS commentS
Neoplasms of mature B cells
Burkitt lymphoma Adolescents or young t(8;14)—translocation “Starry sky” appearance, sheets of lymphocytes
adults of c-myc (8) and with interspersed “tingible body” macrophages
heavy-chain Ig (14) (arrows in A ). Associated with EBV.
Jaw lesion B in endemic form in Africa; pelvis
or abdomen in sporadic form.
Diffuse large B-cell Usually older adults, Mutations in BCL-2, Most common type of non-Hodgkin lymphoma
lymphoma but 20% in children BCL-6 in adults.
Follicular lymphoma Adults t(14;18)—translocation Indolent course with painless “waxing and
of heavy-chain Ig (14) waning” lymphadenopathy. Bcl-2 normally
and BCL-2 (18) inhibits apoptosis.
Mantle cell lymphoma Adult males >> adult t(11;14)—translocation Very aggressive, patients typically present with
females of cyclin D1 (11) and late-stage disease.
heavy-chain Ig (14),
CD5+
Marginal zone Adults t(11;18) Associated with chronic inflammation (eg,
lymphoma Sjögren syndrome, chronic gastritis [MALT
lymphoma]).
Primary central Adults EBV related; Considered an AIDS-defining illness. Variable
nervous system associated with HIV/ presentation: confusion, memory loss, seizures.
lymphoma AIDS CNS mass (often single, ring-enhancing lesion
on MRI) in immunocompromised patients C ,
needs to be distinguished from toxoplasmosis
via CSF analysis or other lab tests.
Neoplasms of mature T cells
Adult T-cell lymphoma Adults Caused by HTLV Adults present with cutaneous lesions; common
(associated with IV in Japan (T-cell in Tokyo), West Africa, and the
drug abuse) Caribbean.
Lytic bone lesions, hypercalcemia.

Mycosis fungoides/ Adults Mycosis fungoides: skin patches and plaques D
Sézary syndrome (cutaneous T-cell lymphoma), characterized by
atypical CD4+ cells with “cerebriform” nuclei
and intraepidermal neoplastic cell aggregates
(Pautrier microabscess). May progress to Sézary
syndrome (T-cell leukemia).
A B C D

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