Incidental Finding of Isolated Pituitary Stalk Duplication in an Asymptomatic Adult

Pituitary stalk duplication (PSD) is an extremely rare congenital anomaly, typically associated with complex midline malformations. We report the incidental discovery of an isolated PSD in a 36-year-old asymptomatic man who underwent MRI for chronic headaches. Imaging revealed two distinct paramedian stalks converging toward an ectopic posterior pituitary, while the anterior pituitary remained normally positioned. No other cerebral, vascular, or facial malformations were identified, and endocrine evaluation was unremarkable. This case highlights a unique, clinically silent radiological entity and underscores the importance of recognizing PSD to prevent misdiagnosis and to ensure adequate endocrine follow-up given its uncertain long-term significance.