Cervical Ganglioneuroma Presenting as a Neck Mass with Horner's Syndrome

Ganglioneuromas (GNs) are benign neoplasms of the autonomic nervous system. They are typically located in the retroperitoneum, posterior mediastinum, and adrenal gland. Rarely, they can arise in the cervical region and present as an enlarging neck mass. However, there have not been any reported cases, to our knowledge, of a GN presenting as Horner's syndrome. An 11-year-old female presented with a neck mass and a history of left-sided ptosis, miosis, and anhidrosis. The mass was excised, and pathology revealed a GN. In patients with a neck mass and Horner's syndrome, GNs should be considered as well as other nerve sheath tumors.