Computed tomography in invasive pulmonary aspergillosis.

Area of Science:

• Radiology
• Infectious Diseases
• Oncology

Background:

• Invasive pulmonary aspergillosis (IPA) and similar angiotrophic fungal pneumonias pose a significant threat to immunocompromised hosts.
• Early diagnosis of IPA is crucial for improving survival rates in patients with hematological malignancies.

Purpose of the Study:

• To evaluate the utility of early chest computed tomography (CT) in the recognition of invasive pulmonary aspergillosis and other fungal pneumonias.
• To identify characteristic CT findings associated with early-stage fungal pneumonia in neutropenic leukemia patients.

Main Methods:

• Chest CT scans were performed on 11 leukemia patients with chemotherapy-induced neutropenia during fungal pneumonia.
• Scans included both contrast-enhanced (n=8) and non-contrast (n=5) examinations.
• CT findings were analyzed based on the timing of the examination relative to the clinical onset of pneumonia.

Main Results:

• Early CT scans (before day 7) consistently showed one or more nodules or mass-like infiltrates with a surrounding halo of low attenuation in all 5 patients.
• This "halo sign" was absent in later CT examinations (after 7 and 15 days).
• Contrast-enhanced CT revealed peripheral enhancement in 4/8 cases, presenting a "target" feature.

Conclusions:

• Early chest CT is a valuable tool for the early recognition of invasive pulmonary aspergillosis and opportunistic fungal pneumonias.
• The presence of nodules with a halo sign on early CT is a key indicator of fungal pneumonia in neutropenic patients.
• Incorporating early chest CT into the management of opportunistic pneumonias can potentially improve patient outcomes.