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Meningeal melanomatosis: a challenge for timely diagnosis
Giulia Berzero1, Luca Diamanti1, Anna Luisa Di Stefano2
1C. Mondino National Neurological Institute, Via Mondino 2, 27100 Pavia, Italy ; Neuroscience Consortium, University of Pavia, Monza Policlinico and Pavia Mondino, 27100 Pavia, Italy.
Abstract:
Neoplastic meningitis is a central nervous system complication that occurs in 3-5% of patients with cancer. Although most commonly seen in patients with disseminated disease, in a small percentage of patients, it may be the initial manifestation of cancer or even primitive in origin. In the absence of cancer history, the diagnosis of neoplastic meningitis may be challenging even for expert neurologists. Prognosis is poor, with a median overall survival of weeks from diagnosis. In the retrospective study herein, we described three cases of meningeal melanomatosis in patients without previous cancer history. The patients were diagnosed with significant delay (17 to 47 weeks from symptom onset) mainly due to the deferral in performing the appropriate testing. Even when the diagnosis was suspected, investigations by MRI, cerebrospinal fluid, or both proved at times unhelpful for confirmation. Prognosis was dismal, with a median survival of 4 weeks after diagnosis. Our observations are a cue to analyze the main pitfalls in the diagnosis of neoplastic meningitis in patients without cancer history and emphasize key elements that may facilitate early diagnosis.
Insights
Neoplastic meningitis, a rare cancer complication, poses diagnostic challenges, especially without a prior cancer history. Early detection is crucial for improving the poor prognosis of this condition.
Area of Science:
- Neurology
- Oncology
- Pathology
Background:
- Neoplastic meningitis (NM) is a serious central nervous system complication affecting 3-5% of cancer patients.
- It can manifest as an initial or primary cancer presentation, complicating diagnosis in patients without a known cancer history.
- Prognosis for NM is generally poor, with median survival measured in weeks.
Observation:
- This study retrospectively analyzed three cases of meningeal melanomatosis presenting without a prior cancer history.
- Patients experienced diagnostic delays ranging from 17 to 47 weeks from symptom onset.
- Diagnostic tools like MRI and cerebrospinal fluid analysis were sometimes inconclusive.
Findings:
- Meningeal melanomatosis can occur as an initial manifestation of cancer, even in the absence of a previous cancer diagnosis.
- Diagnostic delays significantly impact patient outcomes.
- Even with clinical suspicion, confirmation of neoplastic meningitis can be challenging.
Implications:
- Highlights the diagnostic pitfalls of neoplastic meningitis in patients with no prior cancer history.
- Emphasizes the need for heightened clinical suspicion and timely diagnostic workup.
- Suggests refining diagnostic strategies to facilitate earlier identification of neoplastic meningitis.
