Fuentes, PaolaWebar, JavierVergara, CristiánHerrera, MichelleBarthel M, ElizabethVega S., JorgeMatus, Carla2015-10-092016-05-312015-10-092016-05-312015-10-090034-9887http://repositorio.unab.cl/xmlui/handle/ria/2607Indexación: Web of Science; Scielo.Illness presentation in the elderly may be entirely non-specific, with fatigue, loss of function or the presence of geriatric syndromes. We report a 90 years old male consulting in the emergency room for delirium that persisted throughout hospitalization without finding a cause. During the course of hospitalization mild fever appeared and a left knee swelling became apparent. A synovial fluid aspiration showed a leukocyte count of 360 per field with 60% polymorphonuclear cells. The culture was negative. With a presumptive diagnosis of pseudogout, cochicine and celecoxib were started with remission of the confusional state. The patient was discharged 13 days after admission in good conditions. Key words: Aged; Chondrocalcinosis; Delirium; Fever.esAged; Chondrocalcinosis; Delirium; Fever.Artículo