this is the case of a white patient aged 14 diagnosed with kikuchi-fujimoto disease presenting adenopathies prevailing in left cervical region, short-term course fever and involvement of its general condition without weigh loss. authors made studies of general hematology, viral serology and fine needle aspiration biopsy of a cervical ganglion. there were suspicions of neoplasic cells in aspirate. ganglion biopsy showed abundant histiocytes, immunoblasts, and cellular necrosis with nuclear powder and caryorrhesis, as well as a lack of neutrophils and eosinophils. there was a favorable course with disappearance of fever at 20 days from the onset of its manifestations with a gradual regression of adenopathies.