A chest X-ray which is read as having a borderline heartsize is one in which the size of the heart is at the very upper limit of normal. This means that the actual heart size may be normal or slightly increased. If there is a suspicion of increased size based on symptoms, physical exam or EKG, as well as the chest x-ray, an echocardiogram may be performed to determine if it truly is enlarged. Only your physician can decide if this is warranted in your particular case.
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no Edit: if you are a child, your heart is the size of your clenched fist. If you're an adult, it's roughly the size of your two fists put together.
the size of their fist
No, hearts (eg. human hearts) are a little bit bigger; your heart the size of a clenched fist.
No! The size of the human heart in each person is approximately the size of that individuals closed (clenched) fist.
Cup both of your hands in front of you and put the little finger edges against each other, and then imagine the heart taking up that space; that is the average size of the heart, depending on the size of the person.