Rathke pouch epithelial cysts
Between the anterior and posterior pituitary lobe is a common finding in asymptomatic epithelial cysts. These cysts are considered remnants of Rathke pouch. Asymptomatic macroscopic growth of these cysts was seen in 20% of cases. In some cases this can increase to become symptomatic. Most of these symptomatic cysts are an inch or more in diameter and often affect the adult population. They are a major component intrasellar and suprasellar component times.
Cysts have a watery or mucous component. Microscopically, cysts are lined by a cuboidal or cylindrical ciliated epithelium and mucous-producing cells. Sometimes these cysts can be found associated with pituitary adenomas. In some of these cases have demonstrated transitional cell between the cyst and adenoma resulting in a controversial so-called transitional cell tumor of the pituitary gland. Surgical treatment is indicated when there is evidence of growth of the cyst or if it is symptomatic (Figure 1) re and postoperative MRI.