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Case Reports
. 2016 Oct;21(4):358-360.
doi: 10.17712/nsj.2016.4.20160280.

Posterior fossa ruptured dermoid cyst presenting with hydrocephalus

Abrar A Wani  1 , Uday S Raswan, Nayil K Malik, Altaf U Ramzan
Affiliations
Case Reports

Posterior fossa ruptured dermoid cyst presenting with hydrocephalus

Abrar A Wani et al. Neurosciences (Riyadh). 2016 Oct.

Abstract

Dermoid cysts are rare, benign lesions of embryological origin that represent 0.1-0.7% of all intracranial tumors. They are mainly located in the supra tentorial space, especially in the parasellar region. Their location in the posterior fossa remains uncommon. Rupture of intracranial dermoid cysts is a rare phenomenon. We present a case of dermoid cyst, which had ruptured into ventricular system. Computed Tomography and MRI revealed fat in the fourth ventricle, prepontine cistern, and cerebellomedullary cistern. Hydrocephalus was noted. We performed right ventriculo-peritoneal shunt on which patient improved and he continues to remain asymptomatic one year after.

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Figures

Figure 1
Figure 1
Pre-op non-contrast CT brain a) Features of hydrocephalus with marker showing fat in lateral ventricle, b) Changes in the intensity in vermis, possible site of dermoid cyst after rupture and C) Post-op CT scan decompressed ventricle post–operatively with shunt in situ and marker showing fat.
Figure 2
Figure 2
Pre-op MRI with contrast a) Pre–op (T1 MRI)- Fat in the prepontine, cerebellomedullary cistern and fourth ventricle with hydrocephalus, b) Marked area shows intensity changes in vermis (non enhancement on contrast) possible site of dermoid cyst rupture c) post-op MRI (T1) fat in the same regions with ventricle decompression. Also fat visualised in the lateral ventricle.
See this image and copyright information in PMC

References

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