Magnetic Resonance Imaging and Histological Findings of Paranasal Sinus Tumors and Surgical Outcomes in Dogs and Cats

Objective of this study was to report Magnetic resonance imaging (MRI) features of histologically confirmed paranasal sinus tumors and surgical outcomes. Totally 17 dogs and 3 cats were included in the study. Medical records of dogs and cats which were presented between January 2008 and November 2015 due to paranasal sinus tumors were reviewed. Dogs and cats were included if they have full clinical findings, diagnosed by MRI, confirmed histologically, and treated just surgically. Collected data for sex, breed, age, tumor stage, localisation, surgical outcomes, histological diagnosis, survival time and cause of death were included. Soft tissue mass within the nasal cavity replacing the nasal conchae and/or ethmoturbinates and mass invading to the frontal sinuses were determined in 80% (n=16) of the cases in MRI. Nasal and/or frontal bones were destructed in 65% (n=13) of the cases. In 7 dogs bone flap was created to expose and remove the tumor, and the flap was replaced wired after operation. In 10 dogs and 3 cats frontal and/or nasal bone was involved by the tumor, and closure of the defects was carried out with PMMA and wire. In this case series 50% of the tumors were sarcomas, and it was followed by adenocarcinoma (20%) and neuroesthesioblastoma (15%) in decreased rates. Dedicated MRI examination is crucial for diagnosis of paranasal sinus tumors, and surgical intervention as sole treatments looks acceptable for providing better quality of life for certain time.