%0 Journal Article
%T A midline prepontine cyst: Serial magnetic resonance imaging over 20 years shows very slow growth after its rapid shrinkage
%A Jun Sugata
%A Kazuho Hirahara
%A Kazunori Arita
%A Kiyohisa Kamimura
%A Koji Yoshimoto
%A Natsuko Tanoue
%A Tessei Ueda
%J The Neuroradiology Journal
%@ 2385-1996
%D 2019
%R 10.1177/1971400918821085
%X An otherwise healthy 22-month-old boy suffered high fever, irritability, nausea, dysphagia, dysarthria and right hemiparesis. Magnetic resonance imaging showed a cystic mass, 15£¿mm in diameter, with surrounding oedema in the base of the lower pons. The symptoms subsided in about 10 days after onset, followed by a rapid decrease of the cyst size to 5£¿mm. Thereafter, the patient¡¯s psychomotor growth has been normal. Annual follow-up magnetic resonance imaging scans showed very gradual enlargement of the cyst located on the ventral surface of the pontomedullary junction, reaching 16£¿mm in diameter in 21 years after onset. It was hyperintense on T1-weighted and isointense on T2-weighted magnetic resonance imaging. No haemosiderin deposition or gadolinium enhancement was seen. This is a rare report of a two decade longitudinal follow-up of a midline prepontine cyst showing asymptomatic and very slow growth. The possible nature of the cyst includes neurenteric, dermoid and epidermoid cyst
%K Neurenteric cyst
%K endodermal cyst
%K prepontine cyst
%K rupture
%U https://journals.sagepub.com/doi/full/10.1177/1971400918821085