Wording issue: I would guess you are talking about x-rays, because interpretation is made by interpreting various shadows. The term you ? Is very non specific. There are normal organs like the thymus, that can produce an oddly dense feature that overlays the heart and lungs & might be interpreted this way. Other "shadows" are est explained by the people with the x-rays in hand to look at.
Answered 4/12/2013
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