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M48.1 – Ankylosing Hyperostosis (DISH) Explained
M48.1 is the ICD-10 code for ankylosing hyperostosis of the spine (DISH). A degenerative condition characterized by ossification of spinal ligaments and entheses.
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M48.1 is the ICD-10 code for ankylosing hyperostosis of the spine (DISH). A degenerative condition characterized by ossification of spinal ligaments and entheses.
M48.1 – Ankylosing Hyperostosis of the Spine (DISH)
The ICD-10 code M48.1 refers to ankylosing hyperostosis of the spine, commonly known as DISH (Diffuse Idiopathic Skeletal Hyperostosis) or Forestier disease. It is a degenerative skeletal condition characterized by excessive calcification and ossification of the ligaments and tendon insertions along the spine, leading to progressive spinal stiffening.
Causes
The exact cause of DISH remains unclear. However, several risk factors have been identified:
- Older age: The condition predominantly affects individuals over the age of 50.
- Male sex: Men are more commonly affected than women.
- Metabolic conditions: Type 2 diabetes mellitus, obesity, and elevated uric acid levels are associated with DISH.
- Genetic predisposition: Familial clustering has been reported.
- Elevated growth hormone levels (IGF-1): Have also been implicated as contributing factors.
Symptoms
Many individuals remain asymptomatic for a long period. When symptoms do occur, they may include:
- Back pain, particularly in the thoracic (mid-back) region
- Morning stiffness of the spine
- Reduced spinal range of motion
- Difficulty swallowing (dysphagia) due to large cervical bone spurs
- In rare cases, neurological deficits due to nerve compression
Diagnosis
The diagnosis of M48.1 is primarily based on imaging:
- X-rays: The classic finding is flowing ossification along the anterior aspect of at least four consecutive vertebral bodies, often described as a "dripping candle wax" appearance.
- CT (Computed Tomography): Provides more detailed assessment of bony changes.
- MRI (Magnetic Resonance Imaging): Useful for evaluating soft tissue involvement and nerve compression.
- Differentiation from Ankylosing Spondylitis: In DISH, the sacroiliac joints and facet joints are typically spared.
Treatment
There is no curative treatment for DISH. Management focuses on symptom relief and preservation of function:
- Physiotherapy and targeted exercises: To improve and maintain spinal mobility.
- Pain management: Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen or diclofenac for pain and inflammation relief.
- Heat therapy: Can help relax muscles and reduce pain.
- Surgical intervention: Rarely required, but may be necessary in cases of severe dysphagia or neurological complications.
- Management of comorbidities: Optimal control of diabetes mellitus and weight reduction in obese patients.
References
- Resnick D, Niwayama G. Radiographic and pathologic features of spinal involvement in diffuse idiopathic skeletal hyperostosis (DISH). Radiology. 1976;119(3):559-568.
- Mader R et al. Diffuse idiopathic skeletal hyperostosis: clinical features and pathogenic mechanisms. Nature Reviews Rheumatology. 2017;13(7):411-420.
- World Health Organization. ICD-10 Version 2019 – M48.1 Ankylosing hyperostosis. Available at: https://icd.who.int/
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