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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 ...
Postural hypotension is defined as a drop in systolic BP of at least 20 mm Hg accompanied by a drop in diastolic BP of at least 10 mm Hg with upright posture. It is caused by deviation from the normal physiologic response to upright posture, which leads to postural decline of BP or postural hypotension.