Abstract
Background: Intracranial dermoid cyst is a rare, benign, nonneoplastic tumor-like lesion that could cause seizures, headache, and hydrocephalus. We hypothesized that the temporal lobe dermoid cyst in combination with other factors were causing the epileptic seizure. Methods: We encountered a 17-year-old girl with anti-seizure medication-resistant epilepsy secondary to dermoid cyst located in the temporal region depicted on magnetic resonance imaging (MRI). She showed neither symptoms of meningitis nor rupture of the cyst according to serial MRI. We hypothesized that temporal lobe dermoid cyst in combination with other factors, such as focal cortical dysplasia (FCD), etc., was causing epileptic seizures in this case. She underwent dermoid cyst removal surgery with resection of the tip of the antero-inferior temporal lobe. Results: Histopathological study showed multiple small intramedullary dermoid cysts in the left antero-inferior temporal lobe in addition to MRI lesions and FCD. Conclusion: A patient with medically intractable epilepsy secondary to left temporal lobe dermoid cyst showed multiple intramedullary dermoid cysts and focal cortical dysplasia that might have interacted to create epileptogenicity. To our knowledge, this is the first case report of dermoid cyst concomitant with FCD.
Highlights
Intracranial dermoid cyst is a rare, benign, nonneoplastic tumor-like lesion representing 0.04–0.6% of primary brain tumors [1]
We limited the resection area to the antero-inferior temporal lobe with the lesion because the patient showed high intelligence quotient (IQ) and memory scores
We have reported a case of temporal lobe dermoid cyst concomitant with focal cortical dysplasia (FCD) that caused lobe epilepsy
Summary
Intracranial dermoid cyst is a rare, benign, nonneoplastic tumor-like lesion representing 0.04–0.6% of primary brain tumors [1]. Many reports have described patients showing the type of generalized seizure with symptoms of. Many reports have described patients showing the type of generalized seizure with symptoms of aseptic meningitis, and meningitis, chronic impaired awareness seizures without concomitant aseptic concomitant meningitis, aseptic and chronic impaired awareness seizures without which could be considered as epileptic seizures [7,8,9,10,11]. When she underwent a week, she reported the olfactory aura without impaired awareness seizure, and showed no EEG. EEG only reported the olfactory aura without impaired awareness seizure, and showed no changes.Magnetic. The patient remained free seizuresand andfocal-to-bilateral focal-to-bilateraltonic-clonic tonic-clonicseizures seizuresfor forthree threeyears, years,but butstill still experienced experienced seizures olfactory auras during this period. Laboratory data were within normal ranges, including alpha fetoprotein and human chorionic gonadotropin
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