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M46.3 – Discitis: Causes, Symptoms & Treatment
M46.3 is the ICD-10 code for an infection of the intervertebral disc (discitis). This inflammatory spinal condition requires early diagnosis and prompt treatment to prevent complications.
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M46.3 is the ICD-10 code for an infection of the intervertebral disc (discitis). This inflammatory spinal condition requires early diagnosis and prompt treatment to prevent complications.
What Does the Diagnosis M46.3 Mean?
The ICD-10 code M46.3 refers to an infection of the intervertebral disc, commonly known as discitis or spondylodiscitis. This is a serious inflammatory condition in which bacteria, and less commonly fungi or other pathogens, invade the tissue of an intervertebral disc. The intervertebral discs are the cushion-like structures located between the vertebrae of the spine, providing shock absorption and flexibility. Without timely treatment, discitis can lead to permanent damage to the spinal structures.
Causes
Infectious discitis is most commonly caused by a bacterial infection. Pathogens can reach the disc through several routes:
- Haematogenous spread: Bacteria travel through the bloodstream from another infection site in the body (e.g., urinary tract infections, endocarditis, or skin infections).
- Postoperative infection: Spinal surgery can occasionally introduce bacteria into the disc space.
- Direct spread: A nearby infection, such as vertebral osteomyelitis, can extend into the adjacent disc.
- Traumatic inoculation: Rarely, invasive procedures such as discography or spinal injections may introduce pathogens.
The most common causative organism is Staphylococcus aureus. In some cases, gram-negative bacteria, Mycobacterium tuberculosis (tuberculosis), or fungi may be responsible.
Symptoms
The symptoms of discitis can be insidious in onset and are frequently recognised late:
- Back pain: The most prominent symptom, typically severe and persistent even at rest, including at night.
- Restricted spinal mobility: Movement of the affected spinal segment is painful and limited.
- Fever and general malaise: Not always present but may indicate systemic infection.
- Neurological deficits: If the infection spreads to the spinal cord or nerve roots, numbness, weakness, or even paralysis may occur.
- Local tenderness: The affected area of the spine is painful upon palpation.
Diagnosis
Diagnosing discitis requires a combination of clinical assessment, laboratory tests, and imaging:
- Blood tests: Elevated inflammatory markers such as CRP (C-reactive protein) and ESR (erythrocyte sedimentation rate), as well as an increased white blood cell count, are typical findings.
- Blood cultures: Used to identify the causative pathogen circulating in the bloodstream.
- MRI (Magnetic Resonance Imaging): The gold standard for imaging. MRI can detect early signs of infection in the disc and adjacent vertebrae before structural damage is visible.
- CT (Computed Tomography): Used as a complement to MRI, particularly to evaluate bony structures.
- CT-guided biopsy: A tissue sample is taken from the infected disc to identify the specific pathogen and determine antibiotic sensitivity.
Treatment
Conservative Therapy
Treatment depends on the causative organism and severity of the condition. For bacterial discitis, a prolonged course of antibiotic therapy is the cornerstone of management. Treatment typically begins with intravenous antibiotics administered in hospital, followed by a course of oral antibiotics. The total duration is usually 6 to 12 weeks, depending on the pathogen and clinical response. Pain management and spinal immobilisation using a supportive brace may also be recommended.
Surgical Treatment
Surgery is indicated when:
- Neurological deficits are present or deteriorating.
- An abscess (collection of pus) is compressing the spinal cord or nerve roots.
- Conservative therapy fails to control the infection.
- Severe destruction of spinal structures has occurred.
Surgical intervention involves debridement (removal of infected tissue and abscesses) and, where necessary, spinal stabilisation through fusion (spondylodesis).
Prognosis
With early diagnosis and consistent treatment, the prognosis for discitis is generally favourable. However, delayed treatment can result in chronic back pain, permanent loss of spinal mobility, or lasting neurological damage. Regular follow-up with repeat imaging and laboratory monitoring is essential to ensure complete recovery.
References
- Gouliouris T, Aliyu SH, Brown NM. Spondylodiscitis: update on diagnosis and management. Journal of Antimicrobial Chemotherapy, 2010;65(Suppl 3):11–24.
- Herren C, Jung N, Pishnamaz M, Breuninger M, Siewe J, Sobottke R. Spondylodiscitis: Diagnosis and Treatment Options. Deutsches Aerzteblatt International, 2017;114(51–52):875–882.
- World Health Organization (WHO): ICD-10 International Statistical Classification of Diseases and Related Health Problems, 10th Revision – M46.3 Infection of intervertebral disc (pyogenic).
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