The world’s thinnest surgical needles have a diameter of 0.03 millimeters and are just 0.8 mm long. And the thread they pull is so fine, at 0.012 mm in diameter, that it is invisible to the naked eye.
Liver biopsies often use needles to remove a small amount of tissue from the liver for examination. A doctor can use the biopsy to diagnose and assess conditions that affect the liver. A liver biopsy ...
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