Kikuchi-Fujimoto disease of the neck. Update.

Kikuchi-Fujimoto disease (KFD) is a rare entity of uncertain cause that commonly presents with persistently enlarged cervical lymph nodes unresponsive to antibiotic therapy. Although it usually follows a benign course, KFD has been repeatedly misdiagnosed as malignant lymphoma; hence, clinicians and pathologists alike need to be aware of this disease entity. The newest developments regarding the etiology and course of KFD are presented through a review of the literature and a recent illustrative case.