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An isoechoic focal lesion is a region in an imaging study, such as an ultrasound, that has similar echogenicity to the surrounding tissue, making it difficult to distinguish from the adjacent structures. This type of lesion can represent various conditions, including benign tumors, cysts, or malignancies, and often requires further evaluation, such as additional imaging or biopsy, to determine its nature. The term "isoechoic" indicates that the lesion reflects sound waves similarly to the surrounding tissue, which can complicate diagnosis.

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