UC Davis

BACKGROUND: Fluorescence imitating brightfield imaging (FIBI) is a novel alternative microscopy method that can image freshly excised, non-sectioned tissue. We examine its potential utility in dermatopathology by examining readily available specimens embedded in paraffin blocks. METHODS: Nine skin samples embedded in paraffin blocks were superficially deparaffinized using xylene and ethanol and stained with H&E. FIBI captured tissue surface histopathology images using simple microscope optics and a color camera. We then applied deep-learning-based models to improve resemblance to standard H&E coloration and contrast. FIBI images were compared with corresponding standard H&E slides and concordance was assessed by two dermatopathologists who numerically scored epidermal and dermal structure appearance and overall diagnostic utility. RESULTS: Dermatopathologist scores indicate that FIBI images are at least equivalent to standard H&E slides for visualizing structures such as epidermal layers, sweat glands, and nerves. CONCLUSION: Images acquired with FIBI are comparable to traditional H&E-stained slides, suggesting that this rapid, inexpensive, and non-destructive microscopy technique is a conceivable alternative to standard histopathology processes especially for time-sensitive procedures and in settings with limited histopathology resources.