Primary subconjunctival ganglioneuroma.

A ganglioneuroma is an extremely rare benign neoplasm composed of neural elements, including mature ganglion cells that originate from the sympathetic ganglia. It is located most frequently in the posterior mediastinum and can be found in the retroperitoneum, including the adrenal medulla. It may evolve from a differentiating neuroblastoma or may be diagnosed as a primary ganglioneuroma. Primary orbital ganglioneuromas are extremely rare, with only 2 reported cases in young otherwise-healthy individuals. A single, reported case of bulbar conjunctival ganglioneuromas has been described in water buffalos. This is the first report of a primary subconjunctival ganglioneuroma in a young healthy person.