No significant abnormalities means that the examination did not identify changes considered important in the area assessed. The phrase describes that result. It does not mean that every possible illness has been ruled out.
Read it alongside the name of the test, the body area examined and the rest of the report. In an imaging report, it describes what could be seen on those images. The reason for the examination helps determine which findings matter.
Yes. An imaging examination may not answer the question that led to the scan. The result needs to be considered with your symptoms, medical history and any other findings. The phrase alone does not explain persistent symptoms or decide whether another assessment is needed.

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