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[Brainstem acoustic evoked potential (BEAP] in children with posterior fossa tumors]
R Kálmánchey1, K Skripeczki, E Miriszlai
1Semmelweis Orvostudományi Egyetem, II. sz. Gyermekklinika, Budapest.
Insights
Brainstem acoustic evoked potentials (BAEPs) help differentiate pediatric posterior fossa tumors. This non-invasive test aids early diagnosis and monitoring, even before CT scans.
Area of Science:
- Neuroscience
- Pediatric Oncology
- Audiology
Context:
- Posterior fossa tumors are a significant concern in pediatric neuro-oncology.
- Accurate and timely diagnosis is crucial for effective treatment and improved outcomes.
- Conventional imaging like CT scans may not always provide definitive diagnostic information or early detection.
Purpose:
- To investigate the utility of Brainstem Acoustic Evoked Potentials (BAEPs) in the differential diagnosis of pediatric posterior fossa tumors.
- To correlate specific BAEP patterns with tumor location and histological type.
- To assess the role of BAEPs in early diagnosis and treatment monitoring of these tumors.
Summary:
- This study recorded BAEPs in 16 children with posterior fossa tumors (medulloblastoma, astrocytoma, glioma).
- Distinct BAEP patterns were observed correlating with tumor type and location: midline medulloblastoma showed I-V. IPL prolongation; lateral astrocytoma displayed asymmetrical abnormalities; brainstem glioma resulted in distorted waveforms.
- BAEPs demonstrated potential in differential diagnosis, early detection (preceding CT scans), and monitoring treatment response (regression or progression).
Impact:
- BAEPs offer a valuable, non-invasive, and cost-effective tool for diagnosing and managing pediatric posterior fossa tumors.
- This electrophysiological method can complement CT scans, improving diagnostic accuracy and enabling earlier intervention.
- BAEPs facilitate objective assessment of treatment efficacy, guiding therapeutic adjustments in pediatric neuro-oncology.
Abstract:
Brainstem acoustic evoked potentials (BAEPs) were recorded in 16 children with posterior fossa tumours. The results were compared with the clinical course, CT scan findings and the postmortem pathological findings. Eight children had midline medulloblastoma, four children had lateral astrocytoma (two of them cerebellar, one of them pontocerebellar, and one of them craniospinal) and four children had brainstem glioma. Different BAEP pattern could be detected according to the tumour's location and histological nature: 1. In midline medulloblastoma: bilateral, symmetrical, or slightly asymmetrical I-V. IPL prolongation was the common abnormality. Beside that, some of the patients showed III-V., or I-III. IPL prolongation, or V. depression. 2. In lateral astrocytoma: asymmetrical BAEP abnormalities were seen: unilateral V. depression, and/or I-V. IPL prolongation. 3. In brainstem glioma: severely distorted waveform could be observed, with depression and gradual disappearance of components following the wave III. Based on these results BAEP measurement seems to be useful in the differential diagnosis of posterior fossa tumours of childhood, and it can be necessary even beside the CT scan. It can be useful in the early diagnosis, because the BAEP positivity can precede the CT scan positivity, in such a case repeated CT scan required. Finally BAEP measurement proved to be effective in the follow-up of posterior fossa tumours: it can document the tumour's chemotherapeutic regression, or the progression. It is a simple, non-invasive, and cheap method.