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would a lucency on plain film show up as hypo or hyperdense on ct scan

Answer

A lucency on a plain film, which appears as a region of decreased density, corresponds to a hypodense region on a computed tomography (CT) scan. Hypodense areas on CT scans are characterized by lower Hounsfield units (HU) compared to surrounding tissues, appearing darker on the grayscale image.

Clinical implications of hypodense regions on CT scans

In conclusion, a lucency on a plain film would appear as a hypodense region on a CT scan. The clinical implications of these hypodense regions can vary depending on the context, such as in traumatic brain injury, intracerebral hemorrhage, and pulmonary infarction.

References

1

Neurosurgery 2003

Abstract

Comparison of cerebral blood flow in computed tomographic hypodense areas of the brain in head-injured patients

PubMed