Cognitive effects of resecting basal temporal language areas

Area of Science:

• Neurosurgery
• Neurology
• Epileptology

Background:

• Electrical stimulation of the basal temporal region can temporarily disrupt language function.
• The clinical significance of resecting these basal temporal language areas (BTLA) during epilepsy surgery remains unclear.

Purpose of the Study:

• To investigate the correlation between the resection of basal temporal language areas (BTLA) and postoperative language deficits.
• To determine the impact of BTLA resection on specific language functions, particularly confrontation naming and comprehension.

Main Methods:

• Cortical electrical stimulation was used to map the inferolateral temporal lobe in 25 epilepsy patients.
• Electrode positions were verified using 3D CT scans.
• Postoperative language function was assessed 6-12 months after surgery, focusing on naming, comprehension, and memory.

Main Results:

• Eighty percent of patients experienced transient language deficits during stimulation, especially in naming and comprehension.
• Patients undergoing BTLA resection showed a significant decline (9%) in confrontation naming compared to those without resection (4% improvement) (p=0.03).
• Resection size was less predictive of naming deficits than BTLA involvement.

Conclusions:

• Resection of basal temporal language areas (BTLA) is associated with persistent deficits in confrontation naming after temporal lobectomy.
• While many patients tolerate basal temporal lobe removal, particularly in the mid-temporal region, some experience persistent naming impairments.
• Mapping and preservation of BTLA are important considerations in temporal lobectomy for epilepsy.