Overview
What are key features of fever of unknown origin (FUO)?
How is the syndrome of fever of unknown origin (FUO) defined?
How is fever defined in fever of unknown origin (FUO)?
How are the conditions of the differential diagnosis of fever of unknown origin (FUO) categorized?
What are noninfectious inflammatory causes of fever of unknown origin (FUO)?
What are common infectious inflammatory causes of fever of unknown origin (FUO)?
What are less common infectious causes of fever of unknown origin (FUO)?
What are malignant and neoplastic causes of fever of unknown origin (FUO)?
What are miscellaneous causes of fever of unknown origin (FUO)?
What are patient education resources for fever of unknown origin (FUO)?
What is the prognosis of fever of unknown origin (FUO)?
Presentation
Which symptoms suggest a malignant cause of fever of unknown origin (FUO)?
What should be the focus of history for fever of unknown origin (FUO)?
What should be evaluated in the history for fever of unknown origin (FUO)?
How do fever patterns help in the identification of the etiology of fever of unknown origin (FUO)?
Which symptoms suggest a noninfectious inflammatory cause of fever of unknown origin (FUO)?
Which symptoms suggest an infectious inflammatory cause of fever of unknown origin (FUO)?
When should HIV or gonorrhea be considered as the etiology of fever of unknown origin (FUO)?
Which history may suggest a viral etiology for fever of unknown origin (FUO)?
Which symptoms suggest a miscellaneous cause of fever of unknown origin (FUO)?
What are the initial steps in the physical exam of fever of unknown origin (FUO)?
Which physical findings suggest specific causes of fever of unknown origin (FUO)?
DDX
What are diagnostic considerations for tuberculosis in fever of unknown origin (FUO)?
How often does fever of unknown origin (FUO) remain undiagnosed?
What are diagnostic considerations for hepatobiliary infections in fever of unknown origin (FUO)?
What are diagnostic considerations for osteomyelitis in fever of unknown origin (FUO)?
What are diagnostic considerations for parasitic infections in fever of unknown origin (FUO)?
What are diagnostic considerations for a drug-related fever of unknown origin (FUO)?
Which conditions may cause fever of unknown origin (FUO)?
What are the differential diagnoses for Fever of Unknown Origin (FUO)?
Workup
What is the basis for selection of diagnostic tests in fever of unknown origin (FUO)?
What is the role of lab studies in the workup of fever of unknown origin (FUO)?
What is the indication for an HIV serology test in the workup of fever of unknown origin (FUO)?
What is the role of a complete metabolic profile in the workup of fever of unknown origin (FUO)?
What is the role of urinalysis in the workup of fever of unknown origin (FUO)?
What is the role of blood cultures in the workup of fever of unknown origin (FUO)?
What is the role of tuberculosis screening in the workup of fever of unknown origin (FUO)?
Which lab findings suggest a specific cause for fever of unknown origin (FUO)?
What is the role of chest radiography in the workup of fever of unknown origin (FUO)?
What is the role of CT angiography in the workup of fever of unknown origin (FUO)?
What is the role of echocardiography in the workup of fever of unknown origin (FUO)?
What is the role of CT scanning in the workup of fever of unknown origin (FUO)?
What is the role of radionucleotide studies in the workup of fever of unknown origin (FUO)?
What is the role of bone scanning in the workup of fever of unknown origin (FUO)?
What is the role of a naproxen test in the workup of fever of unknown origin (FUO)?
What is the role of endoscopy in the workup of fever of unknown origin (FUO)?
What is the role of biopsies and tissue sampling in the workup of fever of unknown origin (FUO)?
Treatment
What are the treatment options for fever of unknown origin (FUO)?
What are the specific examples of treatment for fever of unknown origin (FUO)?
When is inpatient treatment indicated for fever of unknown origin (FUO)?
How is fever of unknown origin (FUO) managed?
What is the indication for transfer in patients with fever of unknown origin (FUO)?
Which specialist consultations are needed for the treatment of fever of unknown origin (FUO)?
What long-term monitoring is needed for fever of unknown origin (FUO) that remains undiagnosed?
Medications
How are medications for fever of unknown origin (FUO) selected?
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Tender subcutaneous nodules on the anterior shin and foot in an individual with polyarteritis nodosa
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Early rash of systemic lupus erythematosis. Rashes occurring the setting of FUO may be biopsied for diagnosis.[ From eMedicine article, Subacute Cutaneous Lupus Erythematosis]
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Sweet syndrome may herald a hematologic malignancy
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Psoas abscess may cause fevers, but it may be secondary to another condition that may cause FUO, including endocarditis, gastrointestinal or urologic malignancy or infection, vertebral osteomyelitis, or occult intravenous drug use. In this case, an enteric fistula due to underlying Crohn's disease was the culprit.