Ultrasonographic anatomy of the palmar region of the carpus of the dog.

The palmar region of the canine carpus may be injured by traumatic, inflammatory, infectious, neoplastic, and degenerative disorders. The normal ultrasonographic anatomic features of the dorsal region of the canine carpus have been published, however information regarding the palmar region is currently lacking. The aims of this prospective, descriptive, anatomic study were (1) to describe the normal ultrasonographic characteristics of the palmar carpal structures in medium to large-breed dogs, and (2) to establish a standardized ultrasonographic protocol for evaluating them. As in the previously published study, the current study consisted of two phases: (1) identification phase, in which the palmar structures of the carpus were identified ultrasonographically in fifty-four cadaveric specimens and an ultrasonographic protocol to examine them was developed; and (2) descriptive phase, in which the ultrasonographic characteristics of the main palmar structures in twenty-five carpi of thirteen living healthy adult dogs were documented. The tendons of the flexor muscles of the carpus and digits, the superficial and deep parts of the retinaculum flexorum, the carpal canal and the median and ulnar neurovascular structures were ultrasonographically identified and described. Findings from the current study can serve as a reference for evaluating dogs with suspected injury involving the palmar carpal region using ultrasonography.

Oesophageal pneumatosis: computed tomographic characteristics in three dogs (2018-2021).

BACKGROUND: Oesophageal pneumatosis (OP) is defined as the presence of gas within the oesophageal wall. The description of this condition in veterinary medicine is currently lacking. The pathogenesis of alimentary tract pneumatosis remains unclear. Current literature describes that access of gas into the oesophageal wall may occur by one or a combination of the following mechanisms: mucosal disruption, increased intra or extra-luminal pressure or dissection of gas from an extra-oesophageal source. OBJECTIVES: The aim of this multi-centric case series was to describe the computed tomography (CT) findings of OP in dogs. METHODS: Three adult dogs were included. One dog presented with gastrointestinal signs and general malaise while the other two presented with spontaneous facial and cervical subcutaneous emphysema. RESULTS: CT revealed different degrees of intramural gas along the oesophageal wall in all cases. The first dog was diagnosed with emphysematous gastritis based on the presence of gastric pneumatosis paired with compatible clinicopathological and endoscopic findings. This dog was successfully treated with antibiotics. The remaining two dogs were diagnosed with spontaneous pneumomediastinum and required no surgical or medical treatment. CONCLUSIONS: In all cases with OP, there was concurrent gastric pneumatosis. Gas extensively and circumferentially distributed with a banded shape along the oesophageal wall was present in patients with presumed mural gas dissection because of pneumomediastinum. Conversely, a focal and mild amount of mural gas with a tubular shape was identified in the distal segment of the oesophagus in the patient with emphysematous gastritis.

Correction: González-Rellán et al. Anatomy of the Palmar Region of the Carpus of the Dog. Animals 2022, 12, 1573.

In the original publication [...].

Anatomy of the Palmar Region of the Carpus of the Dog.

The palmar region of the canine carpus is anatomically complex, and the information found in the literature about its anatomy is inconsistent. The aims of this prospective, descriptive, anatomic study were (1) the clarification and (2) the description of the precise anatomic composition of the palmar region of the canine carpus, with special reference to the canalis carpi. For this study, 92 cadaveric specimens were obtained from 46 dogs that had died for reasons unrelated to this study. Of these, 43 medium-to-large-breed dogs were randomly selected for the dissection of transverse slices of the carpus. Samples of the flexor retinaculum and flexor carpi radialis tendon and surrounding tissues were taken for complementary histology. For additional histology of the palmar structures in their anatomical position, three small breed dogs were randomly selected for obtaining transverse slices. The anatomic characteristics of the components of the palmar region of the canine carpus were qualitatively described, with special attention to the following structures: flexor retinaculum, flexor carpi radialis muscle, arteria and vena mediana, nervus medianus, interflexorius muscle, flexor digitorum profundus muscle, canalis carpi, and arteria and nervus ulnaris. The findings from this study provide reference information about the anatomy of the palmar region of the canine carpus.

Ultrasonographic anatomy of the dorsal region of the carpus of the dog.

The dorsal region of the canine carpus is anatomically complex and its normal ultrasonographic characteristics have not been published. The aims of this prospective, descriptive, anatomic study were (a) to describe the normal ultrasonographic appearance of the dorsal carpal structures in medium to large breed dogs, and (b) to describe a standardized protocol for evaluations. The final study, based on the methodology developed in a pilot study performed in twenty-two carpi, comprised two phases: (a) identification phase, in which a correlation between ultrasound and dissection and anatomic slices was performed in forty-eight cadaver carpi and the ultrasonographic protocol was developed; and (b) descriptive phase, in which the ultrasonographic characteristics of the examined structures in 23 carpi of 12 alive adult and healthy dogs were recorded. The tendons of the abductor pollicis longus and the extensor muscles of the carpus and digits, the dorsal ligaments of the carpus - including the medial and lateral collateral ligaments - the extensor retinaculum, a distal radioulnar fibrocartilage and the regional osseous surfaces were ultrasonographically identified and described. Findings from the current study can be used as a reference for ultrasonographic examinations in dogs with injuries or other diseases affecting the dorsal region of the carpus.