What does it mean to occupy a place? mathmatics

Is the occupied position, the most commonly used is "occupying lesions":

"Space occupying lesion" is a special term in medical imaging diagnosis, which usually appears in X-ray, B-ultrasound, CT, MRI (magnetic resonance), DSA (digital subtraction angiography) and other examination results. It means: there is an "extra thing" in the inspected part. This "extra thing" can oppress and replace the surrounding tissues. Space-occupying lesions usually refer to tumors (benign and malignant), parasites, stones, hematoma and so on. , and does not involve the cause of the disease.