Neoplasm of unknown or uncertain behavior is another type that can be confusing. This diagnostic term means that the growth is currently benign, but its tissue behavior indicates that it could become malignant over time. This is a legitimate diagnosis that is not the same as a "neoplasm of unspecified behavior," which means the tests are inconclusive in terms of the growth's behavior, and the doctor cannot classify it as malignant, benign, or in situ.

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