What is the most likely diagnosis?
- 42 year-old with lump on head
![](../../caseofweek/caseoftheweekpix2011 435-/cow457-1.jpg)
Axial CT Scans of Head - Bone Window
- Multiple Myeloma
- Osteoma
- Fibrous Dysplasia
- Cephalohematoma
- Dermoid Cyst of Skull
Additional Image - Scout Image of Skull from CT Scan of Head
![](../../graphics/mouseovertoenlarge.png)
Additional Images
![](../../caseofweek/caseoftheweekpix2011 435-/cow457-2.jpg)
Scout Image of Skull from CT Scan of Head
![](../../graphics/mouseovertoenlarge.png)
Answer:
5.Dermoid Cyst of Skull
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Dermoid Cyst of the Skull
General Considerations
- Benign, slow-growing tumors of the skull (“cyst” and “tumor” are used interchangeably)
- Believed to occur secondary to aberrant epidermal or dermal inclusion in the calvarium
- Although rare, it is still , along with Langerhans cell histiocytosis, one of the more common lesions in the pediatric skull