AI-assisted Total Body Dermoscopic Evaluation of Changes in Melanocytic Nevi during Pregnancy: A Prospective, Comparative Study of 2,799 Nevi

Authors

  • Jelissa K. Peter Department of Dermatology, University Hospital of Basel, Basel, Switzerland
  • Fabrice Helfenstein Clinical Trials Unit, University of Bern, Bern, Switzerland
  • Sara E. Cerminara Department of Dermatology, University Hospital of Basel, Basel, Switzerland
  • Julia-Tatjana Maul Department of Dermatology, University Hospital of Zurich, Zurich, Switzerland; Faculty of Medicine, University of Zurich, Zurich, Switzerland
  • Mara L. Zehnder Department of Dermatology, University Hospital of Basel, Basel, Switzerland
  • Dagmar Jamiolkowski Department of Dermatology, University Hospital of Basel, Basel, Switzerland; Department of Pediatric Dermatology and Allergology, Children’s Hospital Auf der Bult, Hannover, Germany
  • Elisabeth Roider Department of Dermatology, University Hospital of Basel, Basel, Switzerland; Cutaneous Biology Research Center, Massachusetts General Hospital, Harvard Medical School, Charlestown, MA, USA
  • Beda Mühleisen Department of Dermatology, University Hospital of Basel, Basel, Switzerland
  • Irene Hösli Department of Obstetrics and Gynecology, University Hospital Basel, Basel, Switzerlan
  • Alexander A. Navarini Department of Dermatology, University Hospital of Basel, Basel, Switzerland
  • Lara V. Maul Department of Dermatology, University Hospital of Basel, Basel, Switzerland; Department of Dermatology, University Hospital of Zurich, Zurich, Switzerland; Faculty of Medicine, University of Zurich, Zurich, Switzerland

DOI:

https://doi.org/10.2340/actadv.v105.41025

Keywords:

Artificial intelligence, Digital Imaging, Melanocytic nevi, Melanoma, Pregnancy

Abstract

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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Published

2025-01-03

How to Cite

Peter, J. K., Helfenstein, F., Cerminara, S. E., Maul, J.-T., Zehnder, M. L., Jamiolkowski, D., … Maul, L. V. (2025). AI-assisted Total Body Dermoscopic Evaluation of Changes in Melanocytic Nevi during Pregnancy: A Prospective, Comparative Study of 2,799 Nevi. Acta Dermato-Venereologica, 105, adv41025. https://doi.org/10.2340/actadv.v105.41025