“…Although there have been case reports of solitary SEGAs occurring in the absence of any other TSC-related lesions, these cases are likely due to somatic mosaicism involving the TSC gene [3,4]. SEGAs occur most commonly in the first two decades of life, with mean age at presentation of 11 years, but they have been reported in the first year of life and as early as 24 weeks gestation [5]. Although these tumors are generally benign, non-infiltrative lesions classified as World Health Organization grade I [6], more aggressive lesions can infiltrate the thalamus, hypothalamus, and basal ganglia, and produce significant perilesional vasogenic edema.…”