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Projection type 2 (meshed skin type). Holograms of the meshed skin type, blood vessels, bones, and tumor were displayed on the body surfaces. The hologram of the meshed skin type helped estimate the depth of the tumor from the body surface. Moreover, the 3-dimensional position of the tumor, which was difficult to understand using only the naked eye, was identified, and the excision range of the tumor could be easily understood.
