Kikuchi-Fujimoto Disease: Diagnosis in a Relapsing Case.

The differential diagnosis of cervical lymphadenopathy is varied. Different age groups require different approaches. Kikuchi-Fujimoto disease or histiocytic necrotizing lymphadenitis is a rare but important diagnosis to consider after excluding more common aetiologies. We present the case of a 21-year-old female with painful left cervical swelling, lasting over a week. Physical examination revealed multiple cervical lymphadenopathies, elastic, non-adherent to deep tissues which were tender to touch. Blood tests showed elevated acute phase proteins. Cytomegalovirus, Epstein-Barr, toxoplasmosis, and human immunodeficiency virus serologies were negative. Computed tomography of the neck revealed multiple cervical lymphadenopathies which were round-shaped, some with necrosis and with extracapsular extent. These features could be compatible with tuberculous lymphadenitis. However, interferon-gamma release assay was negative. Excisional biopsy was scheduled, but spontaneous regression did not allow it. Two weeks later she relapsed. Excisional biopsy revealed histiocytic necrotizing lymphadenitis. Kikuchi-Fujimoto's diagnosis demands high clinical suspicion and histological documentation. This case represents a rare diagnosis of a relapsing disease.