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Distance measurement of primary melanoma and in-transit metastases on three-dimensional (3D) photography. (A) Example demonstrating measurement of the distance (yellow line) along the skin surface between primary melanoma (black) and an in-transit metastasis (red). (B) No significant difference between melanoma of the foot compared to the lower leg is detectable concerning mean, median, and range of distances between melanoma and corresponding in-transit metastases.
