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Aspergillosis

Aspergillosis is an infection or an allergic response caused by a fungus of the Aspergillus type. It may play a role in allergy, but is best known for causing serious pulmonary infections in immunocompromised patients, e.g. those with HIV/AIDS, on chemotherapy or longterm antibiotics. more...

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Causes, incidence, and risk factors

Aspergillosis is caused by a fungus (Aspergillus), which is commonly found growing on dead leaves, stored grain, compost piles, or in other decaying vegetation.

It causes illness in three ways:

  • as an allergic reaction in people with asthma (pulmonary aspergillosis - allergic bronchopulmonary type)
  • as a colonization and growth in a lung injury (such as from tuberculosis or lung abscess) having healed with a resulting cavity, in a nasal sinus or in an aural cavity-where it produces a fungus ball called aspergilloma formed by febrile infiltration of blood or tissue.
  • as an invasive systemic infection with pneumonia, nasal necrosis or aural inflammation and necrosis that is spread to other parts of the body by the bloodstream (pulmonary aspergillosis - invasive type).

The invasive infection can affect the eye, causing blindness, and any other organ of the body, but especially the heart, lungs, brain, and kidneys. The third form occurs almost exclusively in people who are immunosuppressed because of cancer, AIDS, leukemia, organ transplants, high doses of corticosteroid drugs, chemotherapy, or other diseases that reduce the number of normal white blood cells.

Symptoms

Allergic aspergillosis

  • Fever
  • Malaise
  • Coughing
  • Coughing up blood or brownish mucous plugs
  • Wheezing
  • Weight loss
  • Recurrent episodes of lung obstruction

Invasive infection

  • Fever
  • Chills
  • Headaches
  • Cough
  • Shortness of breath
  • Chest pain
  • Increased sputum production, which may be bloody
  • Bone pain
  • Blood in the urine
  • Decreased urine output
  • Weight loss
  • Symptoms involving specific organs
    • Brain: meningitis
    • Eye: blindness or visual impairment
    • Sinuses: sinusitis
    • Heart: endocarditis

Signs and tests

Aspergillosis is detected by:

  • Abnormal chest X-ray or CT scan
  • Sputum stain and culture showing Aspergillus
  • Tissue biopsy (see bronchoscopy with transtracheal biopsy) for aspergillosis
  • Aspergillus antigen skin test
  • Aspergillosis precipitin antibody or galactomannan positivity
  • Elevated serum total IgE (immunoglobulin)
  • Peripheral eosinophilia with allergic disease

Treatment

The goal of treatment is to control symptomatic infection. A fungus ball usually does not require treatment unless bleeding into the lung tissue is associated with the infection; then, surgical excision is required.

Read more at Wikipedia.org


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Diagnosis of invasive pulmonary aspergillosis with multislice CT-angiography
From CHEST, 10/1/05 by Stefan Sonnet

PURPOSE: Invasive pulmonary aspergillosis (IPA) is a frequent infectious complication in neutropenic patients which is associated with a high mortality. IPA is suspected if antibiotic resistant-fever and infiltrates develop in neutropenic patients. The diagnostic yield of bronchoscopy with BAL for IPA is only 30% due to the fact that aspergillus is usually found intravascular. Typical signs on CT scan include the halo sign and consolidations with central necrosis. This study was undertaken to analyze the diagnostic value of CT angiography and to define whether signs of angio-invasiveness are more specific than other CT-signs for IPA.

METHODS: Consecutive immunocompromised patients with antibiotic resistant fever (n=30) underwent pulmonary CT angiographies (16 detector multislice CT) (n=41). CT scans were analyzed for infiltrate, consolidations and the halo sign. CTA were examinated for vessel occlusion. CTA was considered positive if signs of vessel occlusion were detected.

RESULTS: A total of 47 lesions were noticed in 23 CTs (56%). Conversely, in 18 CTs no lesions were found. Histological examination was performed in 33 lesions (12 patients) and not available in 14 lesions (11 patients). In cases with histological examination, CTA was positive (vessel occlusion) in 13 of 16 histologically proven IPA lesions and in 2 non-fungal infiltrates. CTA was negative in 15 lesions with non-fungal etiology and in 3 lesions with documented IPA. In cases without histological confirmation (11 patients, 14 lesions) final diagnosis was based on clinical outcome and CT follow-up. CTA was positive in 6 cases with possible IPA (defined according to guidelines) and negative in 8 lesions without evidence of IPA (hematoma; fibrosing alveolitis; bacterial pneumonia). The overall sensitivity of the CTA sign was 86.4% and the specificity 92.0%. In comparison, the classical halo sign had a sensitivity of only 36.4% and a specificity of 84.0% to detect IPA.

CONCLUSION: CT angiography has a higher sensitivity than the classical CT-signs to detect IPA in neutropenic patients.

CLINICAL IMPLICATIONS: Multislice CT angiography seems to be an excellent diagnostic method to diagnose invasive pulmonary aspergillosis.

DISCLOSURE: Michael Tamm, None.

Stefan Sonnet MD Carlos Buitrago MD Jakob Passweg MD Michael Tamm MD * University Hospital Basel, Basel, Switzerland

COPYRIGHT 2005 American College of Chest Physicians
COPYRIGHT 2005 Gale Group

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