Grant syndrome

Grant syndrome (also known as persistent wormian bones with blue sclerae) is an extremely rare genetic disorder characterized by a distinctive combination of skeletal and connective tissue abnormalities. The condition was first described in a family with multiple affected members across several generations. Key clinical features include persistent wormian bones (small irregular bones found within the sutures of the skull that fail to fuse normally), blue sclerae (a bluish discoloration of the whites of the eyes due to thinning of the scleral tissue), and generalized hypoplasia of the skeletal system. Additional features may include decreased bone density, short stature, and dental anomalies. The condition primarily affects the skeletal system and connective tissues. The persistent wormian bones are notable because while wormian bones can be a normal variant in the general population, their persistence in large numbers and across multiple sutures is considered pathological. Blue sclerae suggest an underlying connective tissue abnormality, a feature shared with other conditions such as osteogenesis imperfecta, though Grant syndrome is considered a distinct entity. Some patients may also exhibit features of bone fragility. There is currently no specific cure or targeted therapy for Grant syndrome. Management is supportive and symptomatic, focusing on monitoring bone health, preventing fractures if osteopenia is present, and addressing any dental or orthopedic complications as they arise. Genetic counseling is recommended for affected families. Due to the extreme rarity of this condition, clinical experience is limited and much of the understanding comes from a small number of reported families.

Common questions about Grant syndrome