IntroductionMorphological information about nasal cavity and paranasal sinuses is clinically very important. This information can be used to study the pathology of the sinus, to determine the treatments, to plan surgery, and to carry out surgical simulations. The most commonly used method for studying the paranasal sinuses is to use index volumetric measurements (1). However, it is not always possible to measure the volume of the sinus clinically because this requires a lot of effort. In the planning of treatment, the healthy sinus can be compared with the diseased sinus (2). Detailed anatomic information about the sinus is important in the determination and application of the method to be used for endoscopic sinus surgery (3,4).The sinuses are physically close to brain, eyes, and major arteries and, therefore, endonasal sinus operation requires a high degree of accuracy (5). Generally, it is difficult to define the size and location of lesions in the head region through clinical and radiographic studies (6). Since traditional radiology overlaps the structures, it does not yield a complete view of the region (7).For the last 10 years, computed tomography (CT) and magnetic resonance (MR) imaging techniques have replaced the imaging of paranasal sinuses by traditional X-ray. These 2 technological modalities can be used in the precise diagnosis and in the determination of more detailed anatomic structure of the diseased region (8). The axial, sagittal, and coronal sections obtained by CT and MR enable better evaluation of these structures (9).CT is used not only in human medicine but also in veterinary medicine. It is commonly used in the evaluation of sinonasal diseases of cats and dogs (10,11).Recently, 2-dimensional images of sinuses obtained by multidetector computed tomography (MDCT) have been transformed into 3-dimensional reconstructions by using a 3-dimensional computer program. In particular, 3-dimensional reconstructions of the maxillary sinus applied in odontotherapy were performed and their volumes were calculated (12,13). Moreover, the volume of maxillary sinuses was calculated by using sectional views obtained from CT of pig skulls ( 14).There are limited reconstructive studies in the literature. This study was performed in order to provide information