Salah Nadimi - DVM graduate, Faculty of Veterinary Medicine, University of Tabriz, Tabriz, Iran
Mohammad Molazem - Department of Radiology and Surgery, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
Seyedhosein Jarolmasjed - Department of Clinical Sciences, Faculty of Veterinary Medicine, University of Tabriz, Tabriz, Iran
Mohammad Reza Esmaili Nejad - Department of Radiology and Surgery, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran

The objective of this study was to evaluate the pituitary gland dimensions due to age and weight using computed tomography (CT) in dogs and cats. The CT images of pituitary gland were assessed in ۱۱ client-owned dogs (six males and five females; age range, ۱ to ۹ years) and ۱۵ client-owned cats (eight males and seven females; age range, ۱ to ۱۴ years) with no evidence of pituitary diseases. The length, height, width and volume of the pituitary gland were measured in sagittal and transverse planes. Mean pituitary length, width, height and volume (± standard deviation: SD) were respectively ۴.۹۶ (± ۰.۶۹ mm), ۳.۶۲ (± ۰.۶۴ mm), ۲.۶۲ (± ۰.۰۵ mm) and ۲۶.۱۹ (± ۷.۹۹ mm۳) in cats and were ۷.۰۰ (± ۲.۱۴ mm), ۴.۸۰ (± ۱.۲۰ mm), ۳.۸۰ (± ۰.۷۰ mm) and ۷۷.۵۳ (± ۵۱.۶۴ mm۳) in dogs, respectively. Mean pituitary height-to-brain ratio (P:B ratio), (± SD) in cats and dogs was ۰.۲۸ (± ۰.۰۵) and ۰.۲۱ (± ۰.۰۳), respectively and mean percent of pituitary volume to brain volume (± SD) in cats and dogs was ۰.۱۰ (± ۰.۰۵) and ۰.۱۰ (± ۰.۰۷), respectively. There was no significant correlation between the size of pituitary gland and age, weight and body condition score (BCS) in dogs, however in cats, significant difference was found between height of pituitary gland and weight and BCS, pituitary width and weight and P:B ratio and BCS. These findings could be useful to identify abnormal pituitary gland enlargement in CT images. To be more accurate in the assessments, further studies are required.

Cat, Computed tomography, Dog, Pituitary gland