Fibrochondrogenesis

Fibrochondrogenesis is an extremely rare, severe skeletal dysplasia (bone disorder) that is typically lethal in the neonatal period. It belongs to a group of conditions characterized by abnormal cartilage and bone development. The disorder is caused by mutations in the COL11A1 or COL11A2 genes, which encode components of type XI collagen, a protein essential for normal cartilage and bone formation. Fibrochondrogenesis can be inherited in either an autosomal recessive or autosomal dominant (de novo) manner depending on the gene involved. The condition profoundly affects the skeletal system, resulting in severe short-limbed dwarfism, a narrow bell-shaped thorax (chest), flat vertebral bodies (platyspondyly), and shortened long bones with broad metaphyses. Characteristic facial features include a flat midface, small nose with anteverted nares, and prominent eyes. The narrow chest leads to pulmonary hypoplasia (underdeveloped lungs), which is the primary cause of death in affected newborns. Histologically, the cartilage shows a distinctive fibrotic appearance with abnormal chondrocytes, which gives the condition its name. Most affected infants are stillborn or die shortly after birth due to respiratory insufficiency caused by the severely restricted thoracic cavity. There is currently no cure or specific treatment for fibrochondrogenesis. Management is supportive and palliative. Prenatal diagnosis may be possible through ultrasound detection of skeletal abnormalities and molecular genetic testing when the familial mutation is known. Genetic counseling is recommended for affected families to discuss recurrence risks.

Common questions about Fibrochondrogenesis