Clinical description and evaluation of 30 pediatric patients with ultra-rare diseases: A multicenter study with real-world data from Saudi Arabia.
Osama Yousef MuthaffarNoura W AlazharyAnas S AlyazidiMohammed A AlsubaieSarah Y BahowarthNour B OdehAhmed K BamagaPublished in: PloS one (2024)
The results suggest that ultra-rare diseases must be viewed as a distinct category from rare diseases with potential demographic and clinical hallmarks. Additional objective and descriptive criteria to detect such cases are needed.