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MRI and proton MR spectroscopy in acute disseminated encephalomyelitis
1Department of Neuroradiology, University of Tübingen Medical School, Germany.
Introduction:
Acute disseminated encephalomyelitis (ADEM) is one of a group of demyelinating disorders of the central nervous system (CNS). It is said to be attributed to an overshooting immunologic response following an infection or vaccination. The clinical course and type of manifestation is heterogeneous. The early application of corticosteroids has been shown to be beneficial to outcome; thus, an early diagnosis is highly desirable.
Methods:
The potential diagnostic value of advanced MR techniques such as proton MR spectroscopy and diffusion-weighted imaging (DWI) was investigated in two paediatric patients with ADEM, one of whom had a remitting and relapsing clinical course and presented with additional cranial nerve involvement. Proton MR spectroscopy revealed typical signs of acute demyelination, such as increased macromolecules, not found in other forms of non-necrotising pathology.
Conclusion:
The addition of proton MR spectroscopy and DWI adds to the diagnostic power of MRI in the setting of post-infectious demyelinating disorders of the CNS or ADEM and may obviate the need for biopsy.
Insights
Advanced MRI techniques, including proton MR spectroscopy and diffusion-weighted imaging (DWI), aid in the early diagnosis of acute disseminated encephalomyelitis (ADEM). These methods can help differentiate ADEM from other conditions, potentially avoiding invasive procedures like biopsies.
Area of Science:
- Neurology
- Radiology
- Immunology
Background:
- Acute disseminated encephalomyelitis (ADEM) is a heterogeneous demyelinating disorder of the central nervous system (CNS).
- It results from an exaggerated immune response post-infection or vaccination.
- Early diagnosis and corticosteroid treatment are crucial for favorable outcomes.
Observation:
- Two pediatric patients with ADEM underwent advanced MRI, including proton MR spectroscopy and diffusion-weighted imaging (DWI).
- One patient exhibited a relapsing-remitting course with cranial nerve involvement.
- Proton MR spectroscopy identified characteristic signs of acute demyelination, such as elevated macromolecules.
Findings:
- Proton MR spectroscopy revealed specific markers of acute demyelination in ADEM.
- Diffusion-weighted imaging (DWI) provided complementary diagnostic information.
- These advanced MR techniques enhanced the diagnostic accuracy for ADEM.
Implications:
- The combination of proton MR spectroscopy and DWI improves MRI's diagnostic capability for ADEM.
- These advanced techniques may eliminate the need for brain biopsy in diagnosing ADEM.
- Enhanced diagnostic power facilitates timely and appropriate patient management.
