What is Elastofibroma Dorsi

Elastofibroma dorsi is a rare, benign, slow-growing soft tissue tumor that typically develops between the shoulder blade (scapula) and the chest wall. While it is technically a tumor, it is not cancerous and does not spread to other parts of the body, often causing symptoms like localized discomfort, swelling, or a snapping sensation during shoulder movement.

What is the nature of Elastofibroma dorsi?

Elastofibroma dorsi is characterized by the overgrowth of fibrous tissue and abnormal elastic fibers. Because it is located in the subscapular region (under the shoulder blade), it often remains unnoticed until it grows large enough to cause visible swelling or physical interference with movement. Unlike malignant sarcomas, Elastofibroma dorsi does not have the potential to metastasize or invade surrounding structures.

Who is typically affected by Elastofibroma dorsi?

This condition is most commonly found in older adults, typically appearing between the ages of 55 and 70. While it can occur in anyone, it shows a notable predilection for women, with some studies suggesting a female-to-male ratio as high as 5:1. Although once considered rare, imaging studies suggest that Elastofibroma dorsi may be underdiagnosed, with autopsy prevalence rates estimated between 1% and 2% in the elderly population.

What causes the development of Elastofibroma dorsi?

The exact cause remains a subject of research, but the leading theory involves repetitive mechanical friction between the shoulder blade and the ribs. Key factors influencing its development include:

• Mechanical stress: Chronic friction in the subscapular space is thought to trigger a reactive fibroelastic proliferation.


• Vascular insufficiency: Repeated minor trauma may lead to localized ischemia (reduced blood flow), prompting abnormal tissue repair.


• Genetic predisposition: While most cases are sporadic, some research suggests a potential underlying genetic susceptibility to abnormal elastic fiber production.

How is Elastofibroma dorsi differentiated from other masses?

Elastofibroma dorsi is unique because of its predictable anatomical location and its distinct imaging appearance on MRI or CT scans. Clinicians often look for the "layered" appearance of alternating fat and fibrous tissue. At DiseaseMaps.org, 7 community members have shared their experiences, helping others distinguish this specific growth from other soft tissue masses like lipomas or sarcomas.

Next steps

• Consult an orthopedic surgeon or a specialist in musculoskeletal oncology to confirm the diagnosis via imaging (MRI is the gold standard).


• Monitor the growth for changes in size or increased pain levels.


• Join the Elastofibroma dorsi community on DiseaseMaps.org to connect with others who have navigated the diagnosis and management process.


• Discuss surgical excision only if the mass causes significant pain or physical limitation, as many cases can be managed with observation.

Medical disclaimer: This information is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD) - Elastofibroma dorsi overview


• Orphanet: Portal for rare diseases and orphan drugs


• PubMed: Current clinical literature on subscapular soft tissue lesions


• OMIM (Online Mendelian Inheritance in Man) regarding fibroelastic proliferative disorders