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as it was said before if it was noise you would see it on all the image, where as here you only see it on the central part of the polyp and the branching so it's fine detail you're seeing.
Noise can generate from high ISO or longer exposures or underexposed pictures when you brighten them up a lot in PP.
On the other hand a higher ISO image or a longer exposure one would show less noise in properly exposed areas. so even if you use high iso and have a good exposure noise will be less visible
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