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Summary
Magnetic resonance (MR) imaging may miss subtle leptomeningeal metastases, even when contrast-enhanced computed tomography (CT) detects them. CT and MR imaging are complementary for diagnosing and monitoring these central nervous system tumors.
Area of Science:
- Neuroradiology
- Oncology
Background:
- Leptomeningeal metastases are secondary malignant tumors spread to the pia mater and arachnoid mater membranes of the brain and spinal cord.
- Accurate diagnosis is crucial for effective treatment and patient management.
Purpose of the Study:
- To evaluate the diagnostic performance of magnetic resonance (MR) imaging compared to contrast-enhanced computed tomography (CT) for detecting leptomeningeal metastases.
- To assess the complementary roles of CT and MR imaging in the diagnosis and follow-up of these metastases.
Main Methods:
- Retrospective analysis of seven patients with central nervous system neoplasia and confirmed leptomeningeal metastases.
- Comparison of findings from contrast-enhanced CT and MR imaging (T1- and T2-weighted sequences).
Main Results:
- MR imaging failed to detect diffuse sulcal enhancement seen on CT in two patients.
- Diffuse cisternal enhancement identified by CT was not visible on MR in four patients.
- MR imaging provided less information than CT for nodular or focal cisternal masses in two patients and could not distinguish ependymal/subependymal metastases from radiation effects or hydrocephalus.
Conclusions:
- Leptomeningeal metastases can be subtle and may be overlooked by MR imaging alone.
- CT and MR imaging should be used as complementary diagnostic tools for leptomeningeal metastasis.
- Combined use of CT and MR imaging improves initial diagnosis and follow-up of tumors with leptomeningeal spread potential.