Spontaneous regression of Rathke's cleft cysts with conservative management: patient series.

Background: Rathke's cleft cysts (RCCs) are benign fluid-filled cysts that develop in the pituitary gland because of the abnormal embryological development of Rathke's pouch. Most RCCs are small and asymptomatic; however, they can present with symptoms or documented growth, sometimes prompting surgical treatment. For smaller asymptomatic lesions, an unknown proportion demonstrates regression over time. This study describes 3 cases of spontaneous RCC regression.

Observations: Three patients with a diagnosis of RCC demonstrated an average decrease of 78% in cyst volume over a mean interval of 3.7 months. One patient experienced the resolution of chronic headaches, whereas the other 2 patients had persistent headaches and endocrinopathies at follow-up. A systematic review included 9 studies that reported results from observational cohorts of patients with RCC, totaling 619 observed patients, with 158 (25.5%) patients demonstrating spontaneous cyst regression. In the patients with cyst regression, the majority had a resolution of symptoms.

Lessons: A substantial proportion of RCC patients managed nonsurgically demonstrated spontaneous regression. There is a role for the conservative management of RCCs in patients without significant symptoms, and surveillance should continue for a minimum of 5 years to confirm cyst stability. For patients undergoing planned surgery, same-day or recent imaging is recommended to prevent operating on involuted RCCs. https://thejns.org/doi/10.3171/CASE24268.