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. 2021 May 24;23(6):809–817. doi: 10.1007/s11307-021-01614-z

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© The Author(s) 2021

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Fig. 2. — Tumor-positive surgical margins. Representative images of an excided tumor specimen, visualized on the mucosal site (a–b) which shows clear delineation of the tumor by fluorescence imaging. Next, the deep resection margin (i.e., basal surface) is shown (c–d), illustrating a sharply delineated fluorescence-positive lesion which correlated with a tumor-positive surgical margin of the respective specimen.