A dult low-grade gliomas (LGGs; World Health Organization [WHO] Grade II) are progressive brain tumors with diffuse borders against normal brain tissue and have a propensity to spread in an infiltrative manner throughout the brain. 16 These tumors demonstrate a tendency to evolve into more aggressive highgrade gliomas (HGGs). WHO Grade I tumors are also usually termed "LGG." However, the nature of these lesions is quite different from their Grade II counterpart in that the Grade I tumor is not infiltrative and usually demonstrates more compact growth characteristics, making it more amenable to complete resection.LGGs compose approximately 15% of all gliomas. 26 Patients most often present with seizures, but they can also demonstrate neurological and cognitive deficits or complain of headache.2,26 There is a clear tendency for patients with these tumors to present earlier in life than those with higher-grade tumors, with the median age at diagnosis being between 40 and 50 years.
11Therefore, female patients are often diagnosed with LGG while within their reproductive years. As clinicians, we are often questioned and expected to counsel female patients on the issue of how pregnancy and delivery affects the biology of their LGG and, ultimately, their own survival. To our knowledge, only 2 other reports detail the effects of pregnancy on patients with LGG. These reports originate from the French glioma study group and feature information on the clinical symptoms and speed of tumor growth in 11 patients and 12 pregnancies.19, 21 The results indicate that there is a peri-gestational increase in lesion growth rates witnessed on MR images. However, is it still unknown how this affects outcome and survival.Since patients often present with seizures, they are