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In both cases hydrocephalus was successfully treated by cerebrospinal fluid diversion prior to tumor presentation. The differential diagnoses, diagnostic testing, and treatment course for these unusual cases are discussed. The importance of follow-up MRI in cases of idiopathic aqueductal stenosis is emphasized by these exemplar cases.<\/jats:p>","DOI":"10.3171\/2017.5.peds1779","type":"journal-article","created":{"date-parts":[[2017,8,4]],"date-time":"2017-08-04T13:55:23Z","timestamp":1501854923000},"page":"329-333","source":"Crossref","is-referenced-by-count":7,"title":["Hydrocephalus presenting as idiopathic aqueductal stenosis with subsequent development of obstructive tumor: report of 2 cases demonstrating the importance of serial imaging"],"prefix":"10.3171","volume":"20","author":[{"given":"Jarod L.","family":"Roland","sequence":"first","affiliation":[{"name":"Departments of Neurological Surgery,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Richard L.","family":"Price","sequence":"additional","affiliation":[{"name":"Departments of Neurological Surgery,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ashwin A.","family":"Kamath","sequence":"additional","affiliation":[{"name":"Departments of Neurological Surgery,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S. 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