Figure Legend
|
Panel A
|
Panel B
|
Panel C
|
Panel D
Figure 5:
Retroclival (posterior fossa and suprasellar) dermoid inclusion cyst in a 49-year-old woman. Panel A Axial CT scan shows a relatively homogeneous mass of low attenuation, similar to that of cerebrospinal fluid. Panel B On the axial T2-weighted MR image, the mass is homogeneously hyperintense relative to brain tissue and isointense to cerebrospinal fluid. The mass has molded itself to conform roughly to the shape of the adjacent brain. (C and D) Sagittal T1-weighted MR images obtained before Panel C and after Panel D administration of gadopentetate dimeglumine demonstrate a homogeneous mass of low signal intensity, yet slightly brighter than cerebrospinal fluid, that does not enhance with the contrast agent (note enhancement of the pituitary stalk and gland). The mass was relatively homogeneous and waterlike in signal intensity because it did not contain sebaceous lipid material, a characteristic suggestive of an epidermoid inclusion cyst. However, histologically, the lesion had skin appendages and a squamous epithelium and, therefore, was a dermoid.
Return to: Cranial Epidermoid and Dermoid Inclusion Cysts
Copyright © 1995 by the Radiological Society of North America