Posterior fossa dermoid cyst with a sinus tract and restricted diffusion on MR imaging: Value of structural imaging findings and signal characteristics

Introduction Intracranial dermoid tumors represent a rare clinical entity that accounts for 0.04 to 0.6% of all intracranial tumors. Their location in the posterior fossa is uncommon. Objectives To report the case of a young woman with a posterior fossa dermoid cyst treated by right far lateral approach. Case Report A 17-year-old woman presenting with swallowing difficulties for 6 weeks was referred for a neurological investigation. A magnetic resonance imaging (MRI) scan showed a hyperintense T1-weighted large expansive lesion occupying the posterior fossa and compressing the anterior face of the brain stem and cerebellum. The patient underwent surgical treatment by right far lateral approach with decompression of vascular and neural structures. The patient presented an uneventful recovery, and was discharged home on the fourth postoperative day without any additional neurological deficits. The anatomopathological analysis confirmed the diagnosis of dermoid cyst. Conclusion The far lateral approach is a safe and feasible route to appropriately treat large posterior fossa dermoid cysts. Decompression of vascular and neural structures is essential to achieve good symptom control.

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Pediatric posterior fossa dermoid cyst: Diagnostic dilemma

Journal of Pediatric Neurosciences ◽

10.4103/jpn.jpn_4_21 ◽

2022 ◽

Vol 0 (0) ◽

pp. 0

Author(s):

BatukD Diyora ◽

Subhashish Dey ◽

Ashish Dubey ◽

Kavin Devani ◽

Mehool Patel ◽

...

Keyword(s):

Dermoid Cyst ◽

Posterior Fossa ◽

Diagnostic Dilemma ◽

Posterior Fossa Dermoid

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Spinal dermoid cyst manifesting with acute urinary retention: CT and MR imaging findings

European Journal of Radiology ◽

10.1016/0720-048x(94)90362-x ◽

1994 ◽

Vol 18 (1) ◽

pp. 34-35 ◽

Cited By ~ 7

Author(s):

D.G.M. Sanders ◽

R.J.S. Lamers

Keyword(s):

Mr Imaging ◽

Urinary Retention ◽

Dermoid Cyst ◽

Acute Urinary Retention ◽

Imaging Findings

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Cranial magnetic resonance imaging findings of leptomeningeal contrast enhancement after pediatric posterior fossa tumor resection and its significance

Journal of Neurosurgery Pediatrics ◽

10.3171/2010.4.peds1058 ◽

2010 ◽

Vol 6 (1) ◽

pp. 87-91 ◽

Cited By ~ 4

Author(s):

Jonathan Loree ◽

Vivek Mehta ◽

Ravi Bhargava

Keyword(s):

Mr Imaging ◽

Posterior Fossa ◽

Imaging Techniques ◽

Tumor Resection ◽

Imaging Study ◽

Leptomeningeal Metastases ◽

Posterior Fossa Tumor ◽

Imaging Findings ◽

Mr Images ◽

Posterior Fossa Tumors

In this report, the authors illustrate the potential shortfalls of early postoperative MR imaging following resection of a posterior fossa tumor. The authors present the cases of a 10-month-old boy and a 14-year-old boy with posterior fossa tumors that were surgically resected and monitored immediately postoperatively with MR imaging. The MR imaging study obtained immediately postresection while the children were still anesthetized revealed enhancing elements in both patients, which were suggestive of leptomeningeal metastases. When this signal was followed on subsequent MR images, it was no longer visible. The patients are both recurrence free at the time of this publication. These cases demonstrate that early postoperative MR imaging findings for leptomeningeal metastases may be unreliable after excision of posterior fossa tumors and may have potential implications for intraoperative MR imaging techniques currently under development.

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