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Liver hypodensity on a CT scan is caused by a variety of factors, according to Radiopaedia, such as benign and malignant neoplasms, focal nodular hyperplasia, focal fatty infiltration, benign epithelial cysts, cysts caused by liver disease and infection, pyogenic abscesses, fungal abscesses, amoebic abscesses, vascular infarctions, lacerations, old ...
On US and sonoHSG, endometrial hyperplasia usually appears as a diffusely thickened, echogenic endometrium (Figure 11). Usually the lesion has an echogenic nodular appearance on ultrasound, while a hypodense nodule on CT scan is common to many conditions. Key Words: nerve block, ultrasound imaging, echogenic needle.