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Laser ablation of subependymal giant cell astrocytomas (SEGAs) is an attractive alternative to maintenance immunotherapy in some children with tuberous sclerosis complex (TSC); however, the effect of treatment on disease progression and the nature and frequency of potential complications remains largely unknown. The authors report the case of a 5-year-old boy with TSC who underwent stereotactic laser ablation of a SEGA at the right foramen of Monro on 2 separate occasions. After the second ablation, immediate posttreatment MRI revealed gadolinium extravasation from the tumor into the lateral ventricle. Nine months later, the patient presented with papilledema and delayed obstructive hydrocephalus secondary to intraventricular adhesions causing a trapped right lateral ventricle. This was successfully treated with endoscopic septostomy. The authors discuss the potential cause and clinical management of a delayed complication not previously reported after a relatively novel surgical therapy.<\/jats:p>","DOI":"10.3171\/2017.11.peds17518","type":"journal-article","created":{"date-parts":[[2018,2,16]],"date-time":"2018-02-16T14:55:36Z","timestamp":1518792936000},"page":"523-527","source":"Crossref","is-referenced-by-count":12,"title":["Trapped ventricle after laser ablation of a subependymal giant cell astrocytoma complicated by intraventricular gadolinium extravasation: case report"],"prefix":"10.3171","volume":"21","author":[{"given":"Michael","family":"Karsy","sequence":"first","affiliation":[{"name":"Department of Neurosurgery, Primary Children\u2019s Hospital, University of Utah School of Medicine, Salt Lake City, Utah"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daxa M.","family":"Patel","sequence":"additional","affiliation":[{"name":"Division of Pediatric Neurosurgery and"},{"name":"Department of Neurosurgery, Primary Children\u2019s Hospital, University of Utah School of Medicine, Salt Lake City, Utah"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert J.","family":"Bollo","sequence":"additional","affiliation":[{"name":"Division of Pediatric Neurosurgery and"},{"name":"Department of Neurosurgery, Primary Children\u2019s Hospital, University of Utah School of Medicine, Salt Lake City, Utah"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"key":"b1","series-title":"Childs Nerv Syst","doi-asserted-by":"publisher","first-page":"232","DOI":"10.1007\/s00381-002-0700-2","article-title":"Subependymal giant cell astrocytoma in children with tuberous sclerosis","volume":"19","author":"Cuccia V","year":"2003","unstructured":"Cuccia V, Zuccaro G, Sosa F, Monges J, Lubienieky F, Taratuto AL: Subependymal giant cell astrocytoma in children with tuberous sclerosis. 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