Histiocytic necrotising lymphadenitis in systemic lupus erythematosus.

Histiocytic necrotising lymphadenitis is the pathognomonic histological appearance of lymph nodes in Kikuchi's disease, a condition characterised by a brief systemic illness and lymphadenopathy. The case is described of a young man, originally diagnosed as having Kikuchi's disease by lymph node histology, who subsequently developed systemic lupus erythematosus with symmetrical polyarthritis, Coombs' positive haemolytic anaemia and haemorrhagic pneumonitis. The case emphasises that a range of diseases is associated with histiocytic necrotising lymphadenitis, belying the unitary impression given by the term Kikuchi's disease.