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MRI in acoustic neuroma: a review of 35 patients
Abstract:
This retrospective study is aimed to assess the diagnostic efficacy of MRI in relation to contrast enhanced CT and air-CT-cisternography. MRI examinations were performed in 35 patients with suspected neurosensorial damage and suggestive of acoustic neuroma: 27 presented on MRI with unilateral tumors, 3 patients had a bilateral tumor and 5 patients were negative on all imaging modalities. The total number of acoustic neuromas detected was therefore 33. To date microscopic analysis has been performed on 12 tumors and histological data based on type Antoni A and Antoni B classification is available. Contrast enhanced CT detected 19 tumors, yielding an overall sensitivity rate of 58%. Air-CT cisternography identified an additional 5 tumors with a sensitivity rate of 100%. MRI identified 33 acoustic neuromas in 30 patients and was negative in 5 patients (sensitivity and accuracy 100%). Considering sensitivity in relation to location, MRI was much better than contrast enhanced CT for internal auditory canal (IAC) tumors (100% versus 36%) and better for cerebello-pontine angle tumors (CPA) tumors (100% versus 68%). The evolution of MRI technique, the various pulse sequences used and their actual selection is discussed. Seven patients received a paramagnetic contrast agent (Gadolinium-DTPA) with the additional benefit of a better demonstration of the tumor. The results suggest that MRI is the best non invasive technique for demonstrating acoustic neuromas.
Insights
Magnetic Resonance Imaging (MRI) demonstrates superior diagnostic efficacy for acoustic neuromas compared to CT scans. MRI achieved 100% sensitivity in detecting these tumors, outperforming other methods.
Area of Science:
- Radiology
- Neurology
- Oncology
Background:
- Acoustic neuromas, also known as vestibular schwannomas, are benign tumors that develop on the nerve leading from the inner ear to the brain.
- Accurate and early diagnosis is crucial for effective management and to prevent complications such as hearing loss and facial nerve damage.
Purpose of the Study:
- To evaluate the diagnostic performance of Magnetic Resonance Imaging (MRI) for acoustic neuromas.
- To compare MRI efficacy against contrast-enhanced Computed Tomography (CT) and air-CT-cisternography.
Main Methods:
- A retrospective study involving 35 patients with suspected acoustic neuromas.
- Patients underwent MRI, contrast-enhanced CT, and air-CT-cisternography.
- Tumor detection rates and sensitivity were compared across imaging modalities.
Main Results:
- MRI detected all 33 acoustic neuromas (100% sensitivity), while contrast-enhanced CT identified 19 (58% sensitivity) and air-CT-cisternography identified an additional 5.
- MRI demonstrated superior sensitivity for tumors in the internal auditory canal (IAC) and cerebellopontine angle (CPA) compared to contrast-enhanced CT.
- Gadolinium-DTPA contrast enhancement further improved tumor visualization in MRI.
Conclusions:
- MRI is the most effective non-invasive imaging technique for diagnosing acoustic neuromas.
- MRI offers significantly higher sensitivity and accuracy, particularly for tumors located within the IAC and CPA.