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Background Tuberous Sclerosis Complex International (TSCi) is a consortium of organizations that supports individuals with tuberous sclerosis complex (TSC) around the world. To improve care for TSC on a global level, TSCi identified the need to expand understanding about existing resources available in other countries, what individuals and caregivers value in TSC care, key gaps between needs and reality in each country, and ways these gaps can be addressed by advocacy organizations around the world. Methods An iterative, mixed methods approach (the Improving Care project) was adopted to incorporate views from diverse members of TSCi. Through idea generation, a collection of qualitative open-ended responses and concept elicitation, we were able to build consensus where shared experiences and opinions were identified. Results The research performed as a part of the Improving Care project revealed a significant gap between the guidelines and what is actually available to people with TSC worldwide. Three key priority areas of action to improve this gap were identified: (1) implementation of the guidelines; (2) access to TSC expertise, and (3) coordinated and integrated health care. Conclusions There are significant opportunities for key stakeholders, including organizations, clinicians, and researchers to improve care for individuals with TSC on both local and global levels. Working across stakeholder groups and utilizing TSC organizations are essential to ensure that the advances in TSC research benefit people living with TSC around the world.

Background\ud Tuberous sclerosis complex (TSC) is an autosomal dominant genetic disease affecting multiple body systems with wide variability in presentation. In 2013, Pediatric Neurology published articles outlining updated diagnostic criteria and recommendations for surveillance and management of disease manifestations. Advances in knowledge and approvals of new therapies necessitated a revision of those criteria and recommendations.\ud Methods\ud Chairs and working group cochairs from the 2012 International TSC Consensus Group were invited to meet face-to-face over two days at the 2018 World TSC Conference on July 25 and 26 in Dallas, TX, USA. Before the meeting, working group cochairs worked with group members via e-mail and telephone to (1) review TSC literature since the 2013 publication, (2) confirm or amend prior recommendations, and (3) provide new recommendations as required.\ud Results\ud Only two changes were made to clinical diagnostic criteria reported in 2013: “multiple cortical tubers and/or radial migration lines” replaced the more general term “cortical dysplasias,” and sclerotic bone lesions were reinstated as a minor criterion. Genetic diagnostic criteria were reaffirmed, including highlighting recent findings that some individuals with TSC are genetically mosaic for variants in TSC1 or TSC2. Changes to surveillance and management criteria largely reflected increased emphasis on early screening for electroencephalographic abnormalities, enhanced surveillance and management of TSC-associated neuropsychiatric disorders, and new medication approvals.\ud Conclusions\ud Updated TSC diagnostic criteria and surveillance and management recommendations presented here should provide an improved framework for optimal care of those living with TSC and their families.