• Amit Kumar Thotakura and Nageswara R Marabathina.
• Department of Neurosurgery, NRI Academy of Sciences, Chinakakani, Mangalagiri, Guntur, Andhra Pradesh, India. Electronic address: doctoramitkumar@gmail.com.
• World Neurosurg. 2017 Dec 1; 108: 995.e1-995.e4.

IntroductionAcquired Chiari malformation and associated syringomyelia have been previously described following lumbar puncture/drainage, lumboperitoneal shunts, and spontaneous cerebrospinal fluid leakage. In addition to these etiologies, space-occupying lesions such as meningiomas, epidermoid cysts, medulloblastomas, and arachnoid cysts are rare causes of acquired Chiari malformation and syringomyelia. We report a rare case of colloid cyst with hydrocephalus causing secondary Chiari malformation with syringomyelia.Case ReportA 58-year-old lady presented with neck pain and difficulty in walking and numbness of all 4 limbs of 1-year duration. Diagnostics with magnetic resonance imaging of the head and the cervical spine were done in the referring hospital. The patients was then referred with the diagnosis of colloid cyst with hydrocephalus and Chiari malformation 1 with cervicodorsal syringomyelia. She underwent colloid cyst excision through the transcallosal approach. Postoperatively the patient showed improvement in her symptomatology. Magnetic resonance imaging of the brain and cervical spine at 6 months' follow-up showed resolved Chiari malformation and resolving syrinx.ConclusionsColloid cyst with hydrocephalus is a rare cause of secondary Chiari malformation with syringomyelia. Surgical management of the underlying lesion improves acquired Chiari malformation and associated syringomyelia.Copyright © 2017 Elsevier Inc. All rights reserved.

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