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A previous study showed that a gastric intramural radiolucent band seen on radiographs and a gastric intramural hypoattenuating layer seen on computed tomography were due to the presence of gastric submucosal fat in a cat. There is no known prevalence and distribution pattern of this gastric submucosal fat in cats. This study was carried out to determine the prevalence and distribution pattern of submucosal fat in cat stomachs. Histologic examination of 41 cat stomachs was performed after scheduled killing of cats, obtained from animal shelters. The results revealed that submucosal fat was present in all stomachs. However, thickness and distribution pattern of the submucosal fat varied. [ABSTRACT FROM AUTHOR]

There are several reports in the veterinary literature on tracheal assessment; however, there is a lack of studies on the trachea in voluntarily breathing dogs. The aim of this study was to describe the natural shape of the trachea in awake dogs and to assess tracheal dimensions and the width-to-height ratio. Thoracic computed tomographic images of awake small breed dogs without any signs of respiratory malfunction (n = 19) were evaluated. Each trachea was categorised into one of four different shapes: circular, horseshoe, crescent or focal dorsal invagination. The circular shape was prominent, particularly in the thoracic inlet and intrathoracic area, while the horseshoe shape was also normally present. In this group of normal dogs, there were no crescent-shaped tracheas, but focally invaginated tracheas were observed. The mean tracheal heights at five locations, namely the caudal endplate of the fourth cervical vertebra, cranial endplate of the seventh cervical vertebra, mid-body of the first thoracic vertebra, mid-body of the third thoracic vertebra, and 1 cm cranial to the carina were 9.12, 8.96, 9.34, 9.88 and 10.16 mm, respectively. The widths at these same sites were 12.26, 10.42, 10.07, 9.82 and 10.23 mm, respectively. The width-to-height ratios of each tracheal location were 1.38, 1.20, 1.10, 1.01 and 1.03, the last two of which are consistent with the circular shape of the intrathoracic trachea. Multi-detector computed tomography under non-general anaesthesia is a non-invasive and unparalleled imaging tool for describing tracheal appearance in healthy awake dogs. [ABSTRACT FROM AUTHOR]

The primary study objective was to determine whether clinical examination and magnetic resonance imaging ( MRI) can underestimate canine gliomatosis cerebri ( GC); we also investigated immunohistochemical features. Seven dogs with GC were studied; four recruited specifically because of minimal MRI changes. Neuroanatomic localization and the distribution of MRI, gross and sub-gross lesions were compared with the actual histological distribution of neoplastic cells. In six cases, clinical examination predicted focal disease and MRI demonstrated a single lesion or appeared normal. Neoplastic cells infiltrated many regions deemed normal by clinical examination and MRI, and were Olig2-positive and glial fibrillary acid protein-negative. Four dogs had concurrent gliomas. GC is a differential diagnosis for dogs with focal neurological deficits and a normal MRI or a focal MRI lesion. Canine GC is probably mainly oligodendrocytic. Type II GC, a solid glioma accompanying diffuse central nervous system neoplastic infiltration, occurs in dogs as in people. [ABSTRACT FROM AUTHOR]

A set of fine-focusing soft x-ray sources has been manufactured to meet the requirements of research and development work at the BEPC Synchrotron Radiation Laboratory. The electrical and optical characteristics of the source as well as preliminary experiments on contact microscopy performed with the source are reported. [ABSTRACT FROM AUTHOR]