"A few cysts may develop with ageing and are generally seen in patients >40 years of age with a low BMI 9."
"The term ‘cystic’ denotes lesions with central gas attenuation contained by a wall, regardless of aetiology. The wall thickness and regularity may vary. The morphology of cystic lesions such as blebs, bullae and cysts overlaps and there are no objective criteria to quantify wall thickness and no consensus regarding definitions 10."
"nodule, exophytic or endophytic"