Fibrodysplasia ossificans progressiva soft connective tissue

Synonyms of Fibrodysplasia Ossificans Progressiva FOP myositis ossificans progressiva General Discussion Fibrodysplasia ossificans progressiva FOP is a very rare inherited connective tissue disorder characterized by the abnormal development of bone in areas of the body where bone is not normally present heterotopic ossificationsuch as the ligaments, tendons, and skeletal muscles. Specifically, this disorder causes the body's skeletal muscles and soft connective tissues to undergo a metamorphosis, essentially a transformation into bone, progressively locking joints in place and making movement difficult or impossible. FOP is characterized by malformed big toes that are present at birth congenital.

Fibrodysplasia ossificans progressiva soft connective tissue

Print Fibrodysplasia Ossificans Progressiva One of the more difficult aspects of practicing medicine may be determining the proper course of treatment for a patient.

Fibrodysplasia ossificans progressiva soft connective tissue

What happens when the very tests essential in making a diagnosis actually exacerbate the condition? In the s, Dr.

The disease is characterized by congenital skeletal malformations and heterotopic ossification HO; bone growth outside of skeletal tissue. It is considered the most catastrophic form of HO, with episodic flare-ups leading to cumulative immobility.

There are no differences in prevalence rates across racial or ethnic groups and geographical regions. The severe disability associated with FOP often results in poor reproductive fitness. To date there are fewer than 10 multigenerational families afflicted worldwide.

A curious aspect of this condition is that the majority of diagnosed cases are spontaneous mutations with no apparent hereditary link. The ACVR1 gene is found in many tissues, including bone, muscle, and cartilage.

Under normal circumstances it provides instructions for producing BMP receptors and helps control bone and muscle growth. It is influential in the gradual replacement of cartilage with bone that occurs over the course of normal human development. Patients with FOP are born with characteristic malformations of the great toes short and bent, sometimes turning inwardbut otherwise these children appear normal.

Within the first decade of life, inflammation and a swelling of soft tissue can be seen flare-ups ; these swellings can be painful, as they transform soft tissue into bone.

Typically, the first indications of HO appear in the back, head, neck, and shoulders, and later can be seen in the chest, hips, knees, and lower extremities.

Oddly, the disease spares some tissue, including the diaphragm, tongue, extra-ocular muscle, cardiac muscle, and smooth muscle. As TIS progresses, the intercostal and paravertebral muscles ossify, as do the aponeuroses.

At this point, spinal deformities may become visually apparent, including kyphoscoliosis or thoracic lordosis. People in the late stages of TIS are chronically hypercarbic, and they lose an important component of respiratory drive.

Common comorbidities of TIS are pneumonia and right-sided heart failure. Patients in advanced stages of TIS may need oxygen therapy. Therapy should be monitored due to a high risk of sudden death associated with oxygen therapy and late-stage TIS. In the early stages, new growths can appear rapidly, sometimes overnight.

Some triggers have been identified.


Trauma to muscle or connective tissue can cause flare-ups, eg, intramuscular vaccinations, dental work, bumps, bruises, or falls can lead to new bone formations. Fever has also been reported prior to HO. Submandibular swelling can be a life-threating factor for individuals with FOP; it can lead to difficulty swallowing and breathing.

Glucocorticoids may be necessary to reduce inflammation in such cases. One of the more well-known cases of FOP is that of Harry Eastlack, who donated his skeleton for scientific research. At the age of 5, Harry broke his leg while playing with his sister.

The fracture never healed properly and shortly thereafter his hip and knee began to stiffen. During an examination, his doctor observed bony growths on the muscles of his thigh.

Within a few years the growths spread throughout his body, along his back, neck, chest, and buttocks. He underwent surgery to excise the bony growths, only to have them reappear again, thicker and more predominant than before.

How Can a Genetic Mutation Cause Muscle to Turn into Bone? - Scientific American

In his mids, his vertebrae fused together and the muscles in his back ossified, contorting his torso, pushing his frame forward into a fixed position.What would happen if some soft tissue cells in your body randomly got the message to transform into stiff bone cells?

Patients born with a disease called fibrodysplasia ossificans progressiva (FOP. A - FOP or Fibrodysplasia ossificans progressiva (Fibro-dis-playsha os-sih-fih-cans pro-gress-eva) means "soft connective tissue that progressively turns to bone." The earliest documented cases date back to the 17th and 18th centuries.

Fibrodysplasia ossificans progressiva (FOP) is a very rare inherited connective tissue disorder characterized by the abnormal development of bone in areas of the body where bone is not normally present (heterotopic ossification), such as the ligaments, tendons, and skeletal muscles.

fibrodysplasia ossificans progressiva (myositis ossificans progressiva) Fibrodysplasia ossificans progressiva (FOP) is a rare entity (only cases in the United States) characterized by the development of nodular painful soft tissue masses that begin in early childhood.

Fibrodysplasia ossificans progressiva (FOP; MIM ) is a rare autosomal dominant disease characterized by progressive heterotopic ossification of soft connective tissues including skeletal muscle, tendons and ligaments. Individuals with FOP appear normal at . Fibrodysplasia ossificans progressiva (FOP) is a rare human genetic disease in which de novo osteogenesis – a developmental process occurring during embryonic skeletal formation – is induced aberrantly and progressively beginning during early childhood in soft connective tissues.

Episodic initiation of spontaneous bone forming lesions occurs over time, affecting a generally predictable .

Fibrodysplasia Ossificans Progressiva - NORD (National Organization for Rare Disorders)