Diagnostic challenge in veterinary pathology: A large vesicle-containing, membrane-bound structure in the myocardium of a cat with cardiomyopathy

Veterinary pathology is a critical field in veterinary medicine, necessary for the diagnosis of diseases in animals. However, it is faced with numerous challenges that impact the accuracy and efficiency of diagnoses. This manuscript explores into the multifaceted issues within this field, and emphasised on diagnostic challenges. Key areas of concern include the complexity of differentiating between similar pathological conditions, the limitations of current diagnostic tools and techniques, and the variability in the manifestation of diseases across different species. Furthermore, the manuscript highlights the shortage of specialised pathologists, which exacerbates diagnostic delays and errors. Advanced diagnostic technologies, such as molecular pathology and digital imaging, are explored for their potential to enhance diagnostic precision, yet their high cost and limited accessibility present significant barriers. The integration of artificial intelligence and machine learning in veterinary diagnostics is also discussed as a promising avenue to overcome some of these obstacles. Case studies illustrating common diagnostic pitfalls and their consequences on animal health are provided, underscoring the need for continuous education and training in this rapidly evolving field. In conclusion, there is need for a concerted effort to standardise diagnostic procedures and improve collaboration among veterinary pathologists, clinicians, and researchers. By addressing these challenges, the veterinary pathology community can improve diagnostic accuracy, ultimately enhancing animal health outcomes.

The lung is composed of conducting airways, a gas-exchange region, and a dual circulatory system. Any of these components may be altered in respiratory disease, and complicated cases can be a diagnostic challenge. For veterinary pathologists, a solid foundation in normal anatomy is essential for recognition of patterns of disease. Additionally, the structure of the lungs informs the function; therefore, knowledge of how normal structures are disrupted provides insight into the pathogenesis of lung diseases. We detail the organizational structure, microanatomy, and cell types of the lungs of several species of veterinary importance: cattle, horses, pigs, sheep, goats, dogs, cats, mice, and rats. Animals with a thick pleura and interlobular septa have associated separation of secondary lobules, whereas those with a thin pleura lack interlobular septa and have indiscernible secondary lobules. The transition between terminal bronchioles and gas-exchange regions, presence of respiratory bronchioles, and cellular composition of the bronchioles are highly variable among species. Other species variations include bronchial structure and glands, collateral ventilation, and patterns of blood supply to the conducting airways, gas-exchange regions, and pleura. Examples of histopathologic correlates offer relevance of pulmonary microanatomy to the veterinary pathologist.

Diagnostic Challenge in Veterinary Pathology: Alopecic Crusting Dermatitis in a Goat.

Diagnostic challenge in veterinary pathology: Does negative Ziehl-Neelsen staining rule out mycobacteriosis?

Announcing "Diagnostic Challenge in Veterinary Pathology".

Diagnostic challenge in veterinary pathology: Bony elbow mass in a domestic ferret.

Diagnostic challenge in veterinary pathology: Mandibular mass in a cow

Diagnostic challenge in veterinary pathology: Nephropathy, gastropathy, and pericarditis in feedlot cattle.

Diagnostic challenge in veterinary pathology: Generalized alopecia in a Holstein dairy cow

Diagnostic challenge in veterinary pathology: Pruritus in a dog with a mixed cellular infiltrate.

Diagnostic challenge in veterinary pathology: Otitis in a humanized NOG-EXL mouse

Diagnostic challenge in veterinary pathology: Detection of BRAFV595E mutation in a dog with follicular cystitis and flat urothelial lesion with atypia.

Diagnostic challenge in veterinary pathology: Disseminated tumor in a young dog.

Diagnostic challenge in veterinary pathology: Mediastinal and retroperitoneal lymphoma without T/B surface antigen expression in a dog.

An approximately 2-month-old, domestic shorthair cat presented to the University of California, Davis Veterinary Medical Teaching Hospital for lethargy, hyporexia, and increased respiratory rate and effort of a few days duration.Clinically, there was tri-cavitary effusion; the pleural effusion, interpreted as a borderline modified transudate, had a nucleated cell count of 130/µl (43% neutrophils, 29% small mononuclear cells, 28% large mononuclear cells), a total protein of 2.5 g/dl, and frequent erythrophagia.Complete blood count abnormalities included an inflammatory leukogram with a left shift (4680 band/µl, 120 metamyelocytes/µl), toxic neutrophils, and a nonregenerative anemia (17.2% hematocrit [30%-50%]).Serum biochemical abnormalities included hypoglobulinemia (2.0 g/dl [2.8-5.4]) with a low-normal albumin (2.4 g/dl [2.2-4.6]),hyponatremia (133 mmol/l [151-158]), hypokalemia (3.1 mmol/l [3.6-4.9]),hypochloremia (101 mmol/l [117-126]), hypophosphatemia (3 mg/dl [3.2-6.3]), and hypoglycemia (59 mg/dl [63-118]).Pleural fluid was quantitative PCR negative for feline coronavirus (feline infectious peritonitis [FIP]), and a feline leukemia virus antigen SNAP test (IDEXX Laboratories, Westbrook, ME, USA) was negative.Echocardiography and chest radiographs did not identify congenital cardiac abnormalities.Due to a guarded prognosis, humane euthanasia was elected.