Incidentally detected ganglioneuroma during pregnancy
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Ganglioneuromas are rare benign tumors of the peripheral nervous system. Ganglioneuromas are fully differentiated from neuroblastomas and ganglioneuroblastomas, and grow wherever sympathetic nervous tissue is found. They most frequently occur in the abdomen in sites such as the adrenal gland and paraspinal retroperitoneum (sympathetic ganglia), and also occur in the posterior mediastinum, head and neck. Retroperitoneal ganglioneuromas are often incidentally detected and are usually asymptomatic. Normally ganglioneuromas are non-functioning, with up to 39% secreting catecholamines. Surgical excision is the treatment of choice and their prognosis is good.

We report a case of incidentally detected ganglioneuroma in the first trimester of pregnancy. And a surgical resection of the ganglioneuroma was done at the time of the cesarean section at full term, without complications.

Case report
A 29-year-old pregnant woman visited the local hospital to confirm her pregnancy. On ultrasound the pregnancy was confirmed (6 weeks), and a pelvic mass was incidentally detected without any symptoms. The patient was transferred to our tertiary hospital for evaluation of the incidentally detected pelvic mass. Ultrasound revealed that there was an about 8 weeks sized embryo in the uterus and a 10 cm sized hypoechoic mass on the left, posterior to the uterus. But it was difficult to distinguish the mass from an adnexal mass, leiomyoma (intraligamentary), or other tumor by the ultrasonographic findings. We checked her serum tumor marker, and performed magnetic resonance imaging....