Intradiploic epidermoid cyst with focal internal enhancement.
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.
Nambu
Atsushi
A
Department of Radiology, St. Marianna University Toyoko Hospital, Kosugi-cho, Nakahara-ku, Kawasaki 211-0063, Japan. nambu-a@gray.plala.or.jp
Imanishi
Yoshimasa
Y
Iwasaki
Yoshie
Y
Fujikawa
Mitsuhiro
M
Hayashi
Tatsuo
T
Shinagawa
Toshihito
T
Araki
Tsutomu
T
D004814:Epidermal Cyst / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D010294:Parietal Bone; D013701:Temporal Bone