Cranial nerve assessment in posterior fossa tumors with fast imaging employing steady-state acquisition (FIESTA).
Steady-state free precession is widely used for ultra-fast cardiac or abdominal imaging. The purpose of this work was to assess fast imaging employing steady-state acquisition (FIESTA) and to evaluate its efficacy for depiction of the cranial nerve affected by the tumor. Twenty-three consecutive patients with posterior fossa tumors underwent FIESTA sequence after contrast agent administration, and then displacement of the cranial nerve was evaluated. The 23 patients with posterior fossa tumor consisted of 12 schwannomas, eight meningiomas, and three cases of epidermoid. Except in the cases of epidermoid, intensity of all tumors increased on FIESTA imaging of the contrast enhancement. In the schwannoma cases, visualization of the nerve became poorer as the tumor increased in size. In cases of encapsulated meningioma, all the cranial nerves of the posterior fossa were depicted regardless of location. The ability to depict the nerves was also significantly higher in meningioma patients than in schwannoma patients (P<0.05). In cases of epidermoid, extension of the tumors was depicted clearly. Although the FIESTA sequence offers similar contrast to other heavily T2-weighted sequences, it facilitated a superior assessment of the effect of tumors on cranial nerve anatomy. FIESTA sequence was useful for preoperative simulations of posterior fossa tumors.
Mikami
Takeshi
T
Department of Neurosurgery, Sapporo Medical University, Sapporo, Japan. tmikami@sapmed.ac.jp
Minamida
Yoshihiro
Y
Yamaki
Toshiaki
T
Koyanagi
Izumi
I
Nonaka
Tadashi
T
Houkin
Kiyohiro
K
D000328:Adult; D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000000981:diagnostic imaging* / Q000473:pathology; D003391:Cranial Nerves / Q000000981:diagnostic imaging* / Q000473:pathology; D005260:Female; D019786:Gadolinium DTPA; D006801:Humans; D007091:Image Processing, Computer-Assisted; D015192:Infratentorial Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D008297:Male; D008579:Meningioma / Q000000981:diagnostic imaging* / Q000473:pathology; D008875:Middle Aged; D009442:Neurilemmoma / Q000000981:diagnostic imaging* / Q000473:pathology; D049268:Positron-Emission Tomography
D019786:Gadolinium DTPA