12 mm = a bit less than 1/2 inch
Neither you, nor I, nor anyone else on this website, or anywhere on the internet,
can decide whether that's anything to worry about. The only people who can
determine that are the Doctor Who ordered the scan and the doctor who performed
it and found the half-incher. It's their job to answer every question you have, and
to make sure you understand every answer.
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1.2 cm in 12mm
To determine how much bigger 14mm is than 12mm, subtract 12mm from 14mm. This calculation shows that 14mm is 2mm bigger than 12mm.
Polyps are swollen, tumorous membranes. Could mean you have signs of tumors underneath the brain. Get it checked out! Presumably if you know you have polyps they are being checked out, ask the doctor, he/she is the person who knows. If it is a friend who has told you they have polyps, ask them, they are probably desperate to talk about it.
12mm is less than 0.07m.12mm=1.2cm=0.012m.12mm can be thought of as "12 thousandths of a metre", just as 0.07m can be thought of as "70 thousandths of a metre".
12mm