When doctors use the term tumor they are talking generically and not about the size of the lesion. A mass usually refers to a lump which is at least 20 mm (0.787 inches) in diameter at its widest point, while a nodule is less than 20 mm at its widest point.
But how big a spiral can you get? Our Milky Way galaxy is pretty beefy, one of the bigger spiral galaxies in the Universe. Itâs roughly 100,000 light-years across, or a quintillion kilometers. Thatâs a lot of kilometers. Donât go bragging to your friends just yet though.
Details: If Earth is a pea of 6mm - 0.23'. Then Sun is a beach ball with a diameter of 66 cm or 26' then, UY Scuti, the biggest star know in our Galaxy, will be a huge orange sphere, three times larger than The Pentagon or 1,1 km - 0.7 miles in diameter. Not a solid sphere but a gaseous one, very, very, extremely rarefied ball of hot (around 3300 degrees) gas.