Article

Intradiploic epidermoid cyst with focal internal enhancement.

Department of Radiology, St. Marianna University Toyoko Hospital, Kosugi-cho, Nakahara-ku, Kawasaki 211-0063, Japan.
Radiation Medicine 05/2006; 24(3):224-7. pp.224-7
Source: PubMed

ABSTRACT We report a case of intradiploic epidermoid cyst with focal internal enhancement. The patient was a 55-year-old woman presenting with right temporal head protrusion and head heaviness. Skull radiography and computed tomography demonstrated an expansile mass in the right diploic space. On magnetic resonance imaging, the mass showed makedly high signal T2-weighted images (T2WI) and intermediate to low signal on T1WI. On contrast-enhanced T1WI, there was nodular internal enhancement, which corresponded to neovascularity on pathology, as well as rim-like enhancement. It should be noted that internal enhancement, an indicator of malignant transformation, may be seen even in a benign epidermoid cyst.

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Keywords

55-year-old woman
 
computed tomography
 
diploic space
 
focal internal enhancement
 
head heaviness
 
intermediate
 
internal enhancement
 
intradiploic epidermoid cyst
 
makedly
 
malignant transformation
 
neovascularity
 
Skull radiography
 
temporal head protrusion
 

Atsushi Nambu