AI-assisted Total Body Dermoscopic Evaluation of Changes in Melanocytic Nevi during Pregnancy: A Prospective, Comparative Study of 2,799 Nevi
DOI:
https://doi.org/10.2340/actadv.v105.41025Keywords:
Artificial intelligence, Digital Imaging, Melanocytic nevi, Melanoma, PregnancyAbstract
Pregnancy-associated changes in melanocytic nevi (MN), apart from size increase on the trunk, remain a topic of debate. We conducted the first prospective study to investigate dermoscopic changes in MN comparing pregnant with non-pregnant women on all body parts using a market-approved convolutional neural network (CNN). We included 25 pregnant and 25 non-pregnant women from Basel, Switzerland, who underwent standard skin cancer screenings and whose MN > 2 mm were digitally recorded and analysed by a CNN. Pregnant women were examined three times: in the first and third trimester and 8–12 weeks postpartum; non-pregnant women twice in an interval of 17–21 weeks. We analysed 2,799 MN. In pregnant women, diameter[p < 0.001], area[p < 0.001], number of colours [p = 0.009], shape asymmetry[p = 0.005] and border sharpness[p = 0.006] (inversely proportional value) increased while ellipseness [p < 0.001] decreased from first trimester to postpartum. Changes occurred mainly during the third trimester to postpartum. Compared to non-pregnant women (only first to third trimester) MN on the upper extremities of pregnant women increased in area[p = 0.011] and diameter[p = 0.025] and decreased in ellipseness[p = 0.037]. MN on the lower extremities increased in area[p = 0.044] and MN on the back increased in colour asymmetry[p = 0.022].
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Copyright (c) 2025 Jelissa K. Peter, Fabrice Helfenstein, Sara E. Cerminara, Julia-Tatjana Maul, Mara L. Zehnder, Dagmar Jamiolkowski, Elisabeth Roider, Beda Mühleisen, Irene Hösli, Alexander A. Navarini, Lara V. Maul

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