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Severin Schramm, Aashna Mehta, Kurtis I. Auguste, and Phiroz E. Tarapore

OBJECTIVE

Navigated transcranial magnetic stimulation (nTMS) is a noninvasive technique often used for localization of the functional motor cortex via induction of motor evoked potentials (MEPs) in neurosurgical patients. There has, however, been no published record of its application in pediatric epilepsy surgery. In this study, the authors aimed to investigate the feasibility of nTMS-based motor mapping in the preoperative diagnostic workup within a population of children with medically refractory epilepsy.

METHODS

A single-institution database was screened for preoperative nTMS motor mappings obtained in pediatric patients (aged 0 to 18 years, 2012 to present) with medically refractory epilepsy. Patient clinical data, demographic information, and mapping results were extracted and used in statistical analyses.

RESULTS

Sixteen patients met the inclusion criteria, 15 of whom underwent resection. The median age was 9 years (range 0–17 years). No adverse effects were recorded during mapping. Specifically, no epileptic seizures were provoked via nTMS. Recordings of valid MEPs induced by nTMS were obtained in 10 patients. In the remaining patients, no MEPs could be elicited. Failure to generate MEPs was associated significantly with younger patient age (r = 0.8020, p = 0.0001863). The most frequent seizure control outcome was Engel Epilepsy Surgery Outcome Scale class I (9 patients).

CONCLUSIONS

Navigated TMS is a feasible, effective, and well-tolerated method for mapping the motor cortex of the upper and lower extremities in pediatric patients with epilepsy. Patient age modulates elicitability of MEPs, potentially reflecting various stages of myelination. Successful motor mapping has the potential to add to the existing presurgical diagnostic workup in this population, and further research is warranted.

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Tizian Rosenstock, Thomas Picht, and Ulrich-Wilhelm Thomale

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Arman Jahangiri, Annette M. Molinaro, Phiroz E. Tarapore, Lewis Blevins Jr., Kurtis I. Auguste, Nalin Gupta, Sandeep Kunwar, and Manish K. Aghi

Object

Rathke cleft cysts (RCC) are benign sellar lesions most often found in adults, and more infrequently in children. They are generally asymptomatic but sometimes require surgical treatment through a transsphenoidal corridor. The purpose of this study was to compare adult versus pediatric cases of RCC.

Methods

The authors retrospectively reviewed presenting symptoms, MR imaging findings, laboratory study results, and pathological findings in 147 adult and 14 pediatric patients who underwent surgery for treatment of RCCs at the University of Californial at San Francisco between 1996 and 2008.

Results

In both the adult and pediatric groups, most patients were female (78% of adults, 79% of pediatric patients, p = 0.9). Headache was the most common symptom in both groups (reported by 50% of pediatric patients and 33% of adults, p = 0.2). Preoperative hypopituitarism occurred in 41% of adults and 45% of pediatric patients (p = 0.8). Growth delay, a uniquely pediatric finding, was a presenting sign in 29% of pediatric patients. Visual complaints were a presenting symptom in 16% of adult and 7% of pediatric patients (p = 0.4). There was no difference between median cyst size in adults versus pediatric patients (1.2 cm in both, p = 0.7). Temporary or permanent postoperative diabetes insipidus occurred in 12% of adults and 21% of pediatric patients (p = 0.4). Kaplan-Meier analysis revealed an 8% RCC recurrence rate at 2 years for each group (p = 0.5).

Conclusions

The incidence of RCCs is much lower in the pediatric population; however, symptoms, imaging findings, and outcomes are similar, suggesting that pediatric RCCs arise from growth of remnants of the embryonic Rathke pouch earlier in life than adult RCCs but do not differ in any other way. It is important to consider RCCs in the differential diagnosis when pediatric patients present with visual impairment, unexplained headache, or hypopituitarism including growth delay. Although the average RCC size was similar in our pediatric and adult patient groups, the smaller size of the pituitary gland in pediatric patients suggests an increased relative RCC size.