[A case of histiocytic necrotizing lymphadenitis showing focal lymph nodes swelling in the abdomen].

A case was 23 years old woman. She came to our hospital with complain of continuing fever after common cold and mass like an egg was touched in right lower abdomen. No other surface lymph node was swelling. Abdominal US, CT and MRI showed that the mass was existed in the front of the psoas muscle and the maximum diameter of it was 6 cm in which necrotizing lesion was recognized. The size of the lymph node became smaller slowly but we could not perfectly exclude malignant disease, we examined needle biopsy for the diagnosis. The histopathological findings showed the histiocytic necrotizing lymphadenitis (HNL). HNL usually appears in the neck area, but in this case it was detected only in the abdomen. This case was very rare and we reported.