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. 2026 May 7;42(1):202. doi: 10.1007/s00381-026-07308-7

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© The Author(s) 2026

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — A Coronal T2-image in a 3-year-old boy with trigonocephaly showing bilateral agenesia of the olfactory bulbs and absence of the olfactory sulci. B Coronal FLAIR image in a 6-year-old boy with non-syndromic multisutural craniosynostosis showing left olfactory bulb agenesia with hypoplasia of the ipsilateral olfactory sulcus (arrowhead, note the origin from the midline and its diagonal course). The right olfactory bulb (small arrow) and olfactory sulcus are normal.