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These parasites are responsible for conditions such as malaria, cryptosporidiosis, and toxoplasmosis, which affect humans and other animals. Apicomplexans exhibit complex life cycles, marked by diverse modes of cell division, which are closely associated with their pathogenesis. All the unique structural and evolutionary characteristics of apicomplexan parasites, the biology underlying life stage transitions, and the singular mechanisms of cell division alongside their associated biomedical relevance have captured the attention of parasitologists of all times. Traditional light and electron microscopy have set the fundamental foundations of our understanding of these parasites, including the distinction among their modes of cell division. This has been more recently complemented by microscopy advances through the implementation of superresolution fluorescence microscopy, and variants of electron microscopy, such as cryo\u2010EM and tomography, revealing intricate details of organelles and cell division. Ultrastructure Expansion Microscopy has emerged as a transformative, accessible approach that enhances resolution by physically expanding samples isometrically, allowing nanoscale visualisation on standard light microscopes. In this work, we review the most recent contributions of U\u2010ExM and its recent improvements and innovations, in providing unprecedented insights into apicomplexan ultrastructure and its associated mechanisms, focusing particularly on cell division. We highlight the power of U\u2010ExM in combination with protein\u2010specific labelling, in aiding the visualisation of long oversighted organelles and detailed insights into the assembly of parasite\u2010specific structures, such as the conoid in\n                    <jats:italic>Plasmodia<\/jats:italic>\n                    , and the apical\u2010basal axis in\n                    <jats:italic>Toxoplasma<\/jats:italic>\n                    , respectively, during new parasite assembly. Altogether, the contributions of U\u2010ExM reveal conserved and unique structural features across species while nearing super resolution. The development of these methodologies and their combination with different technologies are crucial for advancing our mechanistic understanding of apicomplexan biology, offering new perspectives that may facilitate novel therapeutic strategies against apicomplexan\u2010caused diseases.\n                  <\/jats:p>","DOI":"10.1111\/jmi.13387","type":"journal-article","created":{"date-parts":[[2025,1,24]],"date-time":"2025-01-24T07:38:07Z","timestamp":1737704287000},"page":"206-221","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Ultrastructure expansion microscopy: Enlarging our perspective on apicomplexan cell division"],"prefix":"10.1111","volume":"301","author":[{"given":"Sof\u00eda","family":"Horjales","sequence":"first","affiliation":[{"name":"Laboratory of Apicomplexan Biology Institut Pasteur Montevideo  Montevideo Uruguay"},{"name":"Departamento de Innovaci\u00f3n y Emprendimiento Universidad 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