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Mechanism of mutism following the transcallosal approach to the ventricles
1Department of Neurosurgery, Shiga University of Medical Science, Ohtsu, Japan.
Abstract:
Transient mutism has been known as a common manifestation following callosotomy for medically intractable epilepsy, but its cause has not been clearly elucidated. In this paper, we report three cases of mutism following a transcallosal approach to tumours in the lateral and third ventricles and retrospectively analyze the surgical, neurological and radiological features which may suggest the cause of this type of mutism. Mutism may be a result of division of the corpus callosum. Suppression of the limbic system caused by lesions in the anterior cingulate gyrus, septum pellucidum, and fornix may have been of importance in at least two of these three cases. Impairments of the supplementary motor cortex, thalamus and basal ganglia may also be factors reducing speech production. The mechanism of such transient mutism seems to be a complex of two or more of these factors, and their combinations may be different from one case to the other.
Insights
Transient mutism after callosotomy is common but poorly understood. This study suggests it results from a complex interplay of factors affecting speech production, including corpus callosum division and limbic system suppression.
Area of Science:
- Neurosurgery
- Neurology
- Neuroscience
Background:
- Transient mutism is a known complication following callosotomy for epilepsy.
- The precise etiology of post-callosotomy mutism remains unclear.
- This study investigates mutism after transcallosal tumor resection.
Observation:
- Three cases of mutism following a transcallosal approach to lateral and third ventricle tumors are presented.
- Surgical, neurological, and radiological features were retrospectively analyzed.
- Mutism occurred following division of the corpus callosum.
Findings:
- Mutism may result from corpus callosum division.
- Suppression of the limbic system (anterior cingulate gyrus, septum pellucidum, fornix) may contribute.
- Impairments of the supplementary motor cortex, thalamus, and basal ganglia are potential factors.
- The mechanism appears to be a complex of multiple factors, varying between individuals.
Implications:
- Understanding the multifactorial causes of transient mutism is crucial for neurosurgical interventions.
- Identifying specific contributing factors can guide preventative and therapeutic strategies.
- Further research into the neural networks involved in speech production post-surgery is warranted.