What does hounsfield units of 15 to 22 mean?

Hounsfield units (HUs) are a scale used in computed tomography (CT) to measure radiodensity. A range of 15 to 22 HUs typically indicates a low-density substance, which may correspond to fluid, fat, or certain types of soft tissue. In clinical practice, this range can help differentiate between various types of lesions or abnormalities in imaging studies, guiding diagnosis and treatment decisions.