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Dysnomia after left anterior temporal lobectomy without functional mapping: frequency and correlates
B P Hermann1, A R Wyler, G Somes
1Epi-Care Center, Baptist Memorial Hospital, Memphis, Tennessee.
Neurosurgery
|July 1, 1994
Summary
Left anterior temporal lobectomy without functional mapping poses minimal risk to language. However, a small subgroup with later epilepsy onset may experience surgically induced dysnomia, impacting nominal speech.
Area of Science:
- Neurosurgery
- Neurology
- Epilepsy Research
Background:
- The impact of left anterior temporal lobectomy (ATL) on language function without functional mapping is debated.
- Group data analysis may mask individual patient language deficits, such as surgically induced dysnomia.
Purpose of the Study:
- To investigate postoperative language outcomes in patients undergoing left or right ATL without functional mapping.
- To identify subgroups at risk for language decline, specifically dysnomia, after left ATL.
Main Methods:
- Compared preoperative and 6-month postoperative performance on a nominal speech test.
- Analyzed data from 162 nonretarded, left-hemisphere speech-dominant epilepsy patients undergoing ATL (85 left, 77 right).
Main Results:
- A statistically significant but clinically modest difference in language outcome between left and right ATL groups.
- 7% of left ATL patients showed postoperative dysnomia, exceeding the worst outcomes in the right ATL group.
- Postoperative nominal speech decline in left ATL was linked to a later age of epilepsy onset.
Conclusions:
- While group data suggest low language risk with standard left ATL, a specific subgroup (later epilepsy onset) is identified with a risk of surgically induced dysnomia.
- Further research is needed to compare these findings with outcomes using functional mapping.