Question:

Which of the following statements applies to intracranial dermoid cysts?
1. Intracranial dermoid cysts are relatively common tumors.
2. Intracranial dermoid cysts are derived from neuroendocrine tissue.
3. Intracranial dermoid cysts are true neoplasms.
4. Intracranial dermoid cysts are derived from ectopic epithelial cells.
5. Intracranial dermoid cysts are more common than epidermoid cysts.





Answer:

The correct answer for the question "Which of the following statements applies to intracranial dermoid cysts?" is:

4. Intracranial dermoid cysts are derived from ectopic epithelial cells.



Explanation
A. Intracranial dermoid cysts are rare. [Intracranial dermoid cysts are rare, comprising 0.04-0.7% of intracranial tumors]

B. Intracranial dermoid cysts are derived from ectopic epithelial cells. [They are derived from ectopic epithelial cells that are part of the neural tube, which explains their usual location close to the midline]

C. Intracranial dermoid cysts are not true neoplasms. [They are not true neoplasms, as they enlarge through accumulation of desquamation products and sebaceous secretions inside a cystic cavity rather than via cell division.]

D. Correct answer. [They are derived from ectopic epithelial cells that are part of the neural tube, which explains their usual location close to the midline]

E. Epidermoid cysts are far more common than dermoid cysts. [4-9 times rarer than epidermoid cysts] (Summary Table)



From the manuscript:
Ruptured intracranial dermoid cyst manifesting as new onset seizure: a case report
Radiology Case. 2011 Apr; 5(4):10-18


This article belongs to the Neuro section.




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From the manuscript

Ruptured intracranial dermoid cyst manifesting as new onset seizure: a case report

Free full text article: Ruptured intracranial dermoid cyst manifesting as new onset seizure: a case report

Abstract
Intracranial dermoid cysts are rare tumors derived from ectopic epithelial cells. They are slow-growing benign entities, but can cause significant morbidity through compression of neurovascular structures and, rarely, rupture into the subarachnoid space. We present a rare case of a spontaneously ruptured intracranial dermoid cyst presenting as new onset seizures due to chemical meningitis caused by dissemination of fat droplets.






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This article belongs to the Neuro section.


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