List DDs for extranodal masses.
Thymoma
Teratoma (and other germ cell tumors)
Thyroid neoplasm
Mnemonic anterior mediastinal masses.
The 4 T's of anterior mediastinal masses: Thymoma, Teratoma (and other germ cell tumors), Thyroid neoplasm, and Terrible lymphoma.
Describe the Necrotizing lymphadenitis (Kikuchi-Fujimoto disease).
Etiology: unknown
Epidemiology
Rare; most commonly reported in Asian population
Sex: ♀ > ♂
Mean age: 30 years
Clinical features: painful cervical lymphadenopathy and fever
Diagnostics: Lymph node biopsy shows single or multiple necrotic foci, histiocytic cellular infiltration, without granulocytic involvement.
Treatment: typically resolves spontaneously within 1–4 months of onset without treatment
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