In 1896, Marfan described a hereditary disorder of connective tissue that was to become known as Marfan syndrome, the term first being used by Henricus Jacobus Marie Weve (1888–1962) of Utrecht in 1931.
Today, it is thought that Marfan's patient (a five-year-old girl named Gabrielle) was affected by a condition known as congenital contractural arachnodactyly, and not Marfan's syndrome.Further eponymous medical conditions named after Antoine Marfan include:
Dennie–Marfan syndrome
Marfan's hypermobility syndrome
Marfan's law
Marfan's sign
Marfan's symptom
Marfan–Madelung syndromeMarfan also had interests in the pediatric aspects of tuberculosis, nutrition and diphtheria.