Vol. 99  No. May 2006

Usefulness of Three-Dimensional CT Scanning for Preoperative 
Diagnosis of Postoperative Paranasal Sinus Cysts

Kenzo Tsuzuki, Yasuyuki Hinohira, Naoaki Yagnagihara and Kazuomi Yamada
(Takanoko Hospital)
Masafumi Sakagami
(Hyogo College of Medicine)

     The surgical strategy for postoperative paranasal sinus cysts (POSC) is often difficult, even with helical CT and MRI images. Not only the number and location, but also the hardness (bony or soft) of the POSC wall is an important factor to determine surgical approaches. The existing instruments may be unable to resolve the problems above-mentioned.
We have tried to decide on the best surgical strategy for POSC in such difficult cases, using the new three-dimensional CT scan (3D Accuitomo?, Morita, Inc., Kyoto), that provides high resolution sagittal, coronal and axial slice views of complex postoperative structures of the paranasal sinuses. 512 frames of X-ray pictures are taken by 3D-CT, and transmitted to a personal computer (PC) as digital data, where the data are stored as mass volume data. Without being time-consuming, the mass volume data can easily be sliced in parallel in selected planes to obtain the best CT images of interest on the PC. And we can therefore choose appropriate surgical approaches, such as an endoscopic endonasal or transantral method.
Between October 2004 and April 2005, 8 patients with POSC were operated on with the aid of the 3D-CT scan. The CT was very helpful for preoperative diagnosis of the disease.

Key words : postoperative paranasal sinus cyst, 3D-CT, endoscopic sinus surgery

第99巻5号 目次   Vol.99 No.5 contents