atypical lymphadenopathies
Definition: Atypical lymphadenopathies fail to achieve the morphologic criteria of a malignant neoplasm, but exceed the usual concepts of follicular, lymphoid, or sinus histiocytic hyperplasias. Rich cellular proliferations usually composed of prominent histiocytes, or immunoblasts, or both with or without a vascular scaffolding obscure the nodal architecture.
Etiology
infectious lymphadenitis
- nodal toxoplasmosis
- nodal infectious mononucleosis
- nodal zoster
- vaccination-induced lymphadenopathies
dermatopathic lymphadenitis (associated with cutaneous disease)
anticonvulsant pseudolymphoma
- hypersensitivity to anticonvulsants (usually phenytoin),
Chediak-Higashi syndrome
sinus histiocytosis with massive lymphadenopathy
giant lymph node hyperplasia
angioimmunoblastic lymphadenopathy
nodal Kawasaki disease (mucocutaneous lymph node syndrome)
nodal histiocytoses
- acute disseminated histiocytosis
See also
- adenitis
- lymphadenopathies