Glossar (Lexikon)
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Wissenswertes über "Nimbus"
Nimbus refers in meteorology to a cloud type associated with precipitation. In the medical context, it describes a halo or aureole around structures visible in diagnostic imaging procedures.
What is the Nimbus?
The term Nimbus originates from Latin and means cloud or rain cloud. It is used across several fields: in meteorology to describe cloud types, in art as a glowing halo, and in medicine and radiology to refer to a halo effect or luminous rim that appears around certain structures in diagnostic imaging.
Use in Medicine and Radiology
In medical imaging, particularly in computed tomography (CT) and magnetic resonance imaging (MRI), the nimbus effect describes a characteristic halo or radiant border that forms around certain tissue structures, nodules, or lesions. This sign can be diagnostically significant when assessing tumors, cysts, or infectious foci.
Nimbus Sign in CT Imaging
The so-called nimbus sign in computed tomography appears as a bright or dark halo ring surrounding a lesion. This pattern can indicate various conditions, including:
- Fungal infections of the lung (e.g., invasive aspergillosis)
- Metastases or primary lung tumors
- Hemorrhage surrounding a nodule
Nimbus in Meteorology
In meteorology, nimbus serves as a word root in cloud names such as Nimbostratus (a dark, layered rain cloud) and Cumulonimbus (a powerful thunderstorm cloud). These cloud types are associated with heavy precipitation and are relevant in environmental medicine and the assessment of climate-related health impacts.
Nimbus in Art and Cultural History
Originally derived from religious iconography, the nimbus describes the halo or glowing aureole depicted around the heads of holy figures. In medical imaging terminology, the term was adopted analogously to describe glowing or radiant halo phenomena visible around anatomical structures.
Clinical Significance of the Nimbus Sign
Recognizing the nimbus sign in radiology is clinically important, as it provides the treating physician with valuable clues regarding the nature of a tissue change. It is most commonly observed in immunocompromised patients and may indicate a life-threatening invasive fungal infection of the lungs. Early diagnosis and prompt treatment are critical in these cases.
References
- Hansell, D. M. et al. - Fleischner Society: Idiopathic Interstitial Pneumonias. Radiology, 2008.
- World Health Organization (WHO) - Guidelines for the Diagnosis and Management of Fungal Infections, 2022.
- Prokop, M. & Galanski, M. - Whole-Body Computed Tomography. Thieme Publishers, 2007.
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