Mandibular Nodes Research Articles

Surgical Treatment of Primary Mast Cell Tumor in Mucosal Surface of Lower Lip in a Dog: A Case Report

Introduction: Mast cell tumors (MCTs) have been described as a form of cancer affecting a specific type of blood cell that typically plays a role in the body's reaction to allergens and inflammatory processes. The MCTs have been classified as skin tumors in dogs which can also affect other areas of the body, such as the spleen, liver, gastrointestinal tract, and bone marrow. The present study investigated the clinical and histological signs, biological behavior, and treatment of primary oral mast cell tumors. Case report: A 3-year-old neutered female, weighing 18 kg and classified as a medium mixed breed, was referred to a veterinary clinic in Mashhad (Iran) due to the presence of a pink, lobulated mucosal mass located on the internal surface of her lower lip. Although the vital signs were normal, clinical examination, radiology, and an incisional biopsy were performed from the lesion site under general anesthesia for histology study. Histopathological features were similar to those of mastocytoma in this case. On presentation, no concurrent mass was found on other sides of the body. Mandibular lymph nodes were not enlarged; however, the incisor teeth of the mandible were loosed. Accordingly, the primary oral MCTs were diagnosed. The surgery was done and After a follow-up period of 150 days post-excisional surgery for a Mast cell tumor, the patient remained alive and exhibited no visible signs of tumor recurrence or surgical complications. Conclusion: The current case report defined a primary Mast cell tumor with slow tumor growth and without metastasis in the mucosal surface of the lower lip in a dog treated by complete excisional surgery only, unlike some previous studies of primary oral MCTs in dogs with aggressive biological behaviors.

Paraneoplastic hypercalcemia in a canine patient with a mandibular salivary carcinoma.

To describe a novel presentation of paraneoplastic hypercalcemia caused by a canine salivary carcinoma. A 6-year-old intact male Husky with hypercalcemia and a spontaneous salivary carcinoma, stage III. The dog presented with polyuria, polydipsia, and hypercalcemia. Physical examination revealed a 37 X 43-mm firm mass in the ventrolateral aspect of the right-hand side of the neck, caudal to the temporomandibular joint. Incisional biopsy was suspicious of metastatic carcinoma to the mandibular lymph node. A full-body CT scan found a large, heterogenous, contrast-enhancing mass on the right ventrolateral neck that appeared to be originating from either the mandibular lymph node or right mandibular salivary gland. Parathyroid hormone-related protein was considered within normal reference intervals, and both parathyroid glands appeared ultrasonographically normal. The patient was treated with a marginal surgical excision of the mass, without immediate complications. Histopathology confirmed the presence of a salivary carcinoma with narrow margins of excision and invasion of the mandibular lymph node. Twenty-four hours after surgery, ionized calcium returned to normal reference values and clinical signs completely resolved. Hypercalcemia is an urgent pathology with important systemic implications requiring prompt diagnosis and intervention. In this case report, we identify the first salivary carcinoma associated with a paraneoplastic hypercalcemia, including this pathology as a new differential diagnosis. The hypercalcemia resolved with marginal surgical excision, but interestingly the parathyroid hormone-related protein was not overexpressed, meaning that this neoplasia could mediate hypercalcemia by another pathophysiological mechanism.

Computed tomography findings of nasal cryptococcosis in Australia (2008-2020): 12 dogs and 9 cats.

To describe the CT findings of Australian dogs and cats with nasal cryptococcosis over a 12-year period. 12 dogs and 9 cats diagnosed with nasal cryptococcosis from 2008 through 2020. CT findings were compared among enrolled cases from Australian veterinary referral centers. Disease severity was compared between a subset of patients with cryptococcal speciation performed (n = 6 dogs; n = 3 cats) and geographic domicile. Dogs demonstrated diffuse disease affecting numerous nasal regions and sinuses. Cats displayed more focal nasal and nasopharyngeal disease. Dogs were more likely to have a nasal mass, whereas cats were more likely to have a nasopharyngeal mass. Cribriform plate lysis was common in dogs but not observed in cats. Sinonasal osteolysis was a common feature in both species. Mandibular lymph nodes were commonly enlarged in dogs, whereas in cats, the retropharyngeal lymph nodes were more likely enlarged. There was no obvious difference in disease severity or lesion distribution in relation to the causal species of Cryptococcus, although to determine if this finding is robust, an appropriately powered prospective study is warranted. There are numerous studies describing the clinical features, treatment, and outcomes of dogs and cats with cryptococcosis. To the best of our knowledge, there is only 1 previous study describing the CT features of nasal cryptococcosis, undertaken in one part of North America. Our study describes the CT features of nasal Cryptococcus sp in an Australian canine and feline cohort, adding new pertinent observations while reinforcing reported radiological observations.

A suitable sampling strategy for the detection of African swine fever virus in living and deceased pigs in the field: a retrospective study.

African swine fever (ASF) is a fatal disease that threatens the health status of the swine population and thus can impact the economic outcome of the global pig industry. Monitoring the ASF virus (ASFV) is of utmost concern to prevent and control its distribution. This study aims to identify a suitable sampling strategy for ASFV detection in living and deceased pigs under field conditions. A range of samples, comprising tissues obtained from deceased pigs, as well as serum and tonsil swab samples from live pigs, were gathered and subjected to detection using the qPCR method. The findings revealed that the mandibular lymph nodes demonstrated the highest viral loads among superficial tissues, thereby indicating their potential suitability for detecting ASFV in deceased pigs. Additionally, the correlations between virus loads in various tissues have demonstrated that tonsil swab samples are a viable specimen for monitoring live pigs, given the strong associations observed with other tissues. These findings indicated two dependable sample types for the detection of ASFV: mandibular lymph nodes for deceased pigs and tonsil swabs for live pigs, which supply some references for the development of efficacious preventive measures against ASFV.

Systemic AL kappa chain amyloidosis in a captive Bornean orangutan (Pongo pygmaeus)

Systemic amyloid light-chain (AL) amyloidosis is an infrequent disease in which amyloid fibrils derived from the immunoglobulin light chain are deposited in systemic organs, resulting in functional impairment. This disease has been notably uncommon in animals, and nonhuman primates have not been reported to develop it. In this study, we identified the systemic AL kappa chain amyloidosis in a captive Bornean orangutan (Pongo pygmaeus) and analyzed its pathogenesis. Amyloid deposits were found severely in the submucosa of the large intestine, lung, mandibular lymph nodes, and mediastinal lymph nodes, with milder lesions in the liver and kidney. Mass spectrometry-based proteomic analysis revealed an abundant constant domain of the immunoglobulin kappa chain in the amyloid deposits. Immunohistochemistry further confirmed that the amyloid deposits were positive for immunoglobulin kappa chains. In this animal, AL amyloidosis resulted in severe involvement of the gastrointestinal submucosa and lymph nodes, which is consistent with the characteristics of AL amyloidosis in humans, suggesting that AL amyloid may have a similar deposition mechanism across species. This report enhances the pathological understanding of systemic AL amyloidosis in animals by providing a detailed characterization of this disease based on proteomic analysis.

NIR-II nanoprobes for investigating the glymphatic system function under anesthesia and stroke injury

The glymphatic system plays an important role in the transportation of cerebrospinal fluid (CSF) and the clearance of metabolite waste in brain. However, current imaging modalities for studying the glymphatic system are limited. Herein, we apply NIR-II nanoprobes with non-invasive and high-contrast advantages to comprehensively explore the function of glymphatic system in mice under anesthesia and cerebral ischemia–reperfusion injury conditions. Our results show that the supplement drug dexmedetomidine (Dex) enhances CSF influx in the brain, decreases its outflow to mandibular lymph nodes, and leads to significant differences in CSF accumulation pattern in the spine compared to isoflurane (ISO) alone, while both ISO and Dex do not affect the clearance of tracer-filled CSF into blood circulation. Notably, we confirm the compromised glymphatic function after cerebral ischemia–reperfusion injury, leading to impaired glymphatic influx and reduced glymphatic efflux. This technique has great potential to elucidate the underlying mechanisms between the glymphatic system and central nervous system diseases.Graphical

Leucemia linfocítica crônica em cão Shih-Tzu

Chronic Lymphocytic Leukemia (CLL) is defined as a malignant neoplasm originating from hematopoietic stem cells in the bone marrow, where the lymphocytes found in the circulation are mature and well-differentiated. The disease is rare in dogs and cats, and when it occurs, it typically affects elderly animals. This study presents an atypical clinical case of a two-years-old Shih Tzu diagnosed with chronic lymphocytic leukemia. The clinical presentation of the patient included characteristic signs of CLL, such as lymphocytosis, lymphadenomegaly, splenomegaly, and hepatomegaly. Observed symptoms included lethargy, fatigue, panting, and enlargement of the mandibular lymph nodes. Additionally, anemia and thrombocytopenia were identified, aligning with common patterns in dogs with CLL. The diagnosis was achieved through various examinations, including ultrasound, radiography, complete blood count, serum biochemistry, cytology, and parasitological tests (4DX and leishmaniasis). However, definitive confirmation of CLL was obtained through bone marrow examination. In response to the diagnosis, therapeutic intervention followed the protocol established in the literature, involving the administration of Chlorambucil and Prednisone. The results of the applied treatments reflected positively on the patient, demonstrating clinical improvement and stability. The adopted therapeutic protocol aimed to control symptoms and prolong the life of the affected animal. The objective of this study is to contribute to epidemiological data, elucidate the pathogenic course, and seek more effective diagnostic and therapeutic approaches for CLL in dogs. The detailed investigation of this case and the dissemination of results aim to provide a solid foundation for future research, with the goal of improving the quality of life for dogs affected by chronic lymphocytic leukemia.

Diffuse large B-cell lymphoma with DNA copy number changes in a Japanese black calf

A 2-month-old Japanese Black calf exhibited mandibular and superficial cervical lymph node swelling. Fine needle aspiration cytology of the superficial cervical lymph node revealed large lymphoblast-like cells with mitoses. Hematological examination revealed remarkable lymphocytosis with atypical lymphocytes. Increased activities of serum total lactate dehydrogenase and thymidine kinase were detected. At necropsy, generalized swelling of lymph nodes was observed. Histopathological analysis revealed diffuse proliferation of medium-sized round centroblastic neoplastic cells that were positive for CD20, CD79α, PAX5, and BLA-36, and negative for CD3, CD5, CD10, and CD34. The calf was diagnosed with centroblastic diffuse large B-cell lymphoma (DLBCL) based on these findings. Analysis of DNA copy number variation revealed an increased copy number for the GIMAP family relative to that in healthy cattle. Moreover, decreases in copy numbers of GBP-1, MIR3141, OR5P1E, and PTPRG relative to those in healthy cattle were also observed. Because DNA copy number variation represent a major contribution to the somatic mutation landscapes in human tumors, these findings suggest that DNA copy number changes might have contributed to the onset of DLBCL in the present case.

Abstract 4183: Utility of the highly immunodeficient SRG rat for combined drug efficacy, pharmacokinetics, and toxicology studies in tumor-bearing animals

Abstract Immunodeficient rodents are vital pre-clinical disease models. Historically, immunodeficient mice have been standard for hosting human cell and tissue xenografts, enabling cancer drug efficacy and tolerability testing. However, an immunodeficient rat that supports a variety of human cancer types provides a larger model for easier surgical manipulation and serial blood and tumor tissue sampling, allowing for efficacy, pharmacokinetics, and toxicology testing in the same animal. We created a Sprague Dawley Rag2 -/-, Il2rg -/- rat (SRG Rat®; SRG) that is highly supportive of human cell and tissue engraftment. The SRG rat lacks B, T, and NK cells and is more immunodeficient than the Nude rat. Here we show comparative pathology between the SRG rat and its parental strain, the CRL Sprague Dawley (CD). We also present data from an efficacy study in tumor bearing SRG rats, demonstrating that serial blood draws and tumor biopsies can be performed in tumor bearing animals to assess drug pharmacokinetics and pharmacodynamics within a single study. First, we assessed 10 SRG (5/sex) and 10 CD (5/sex) at 8-10 weeks of age. Body weight, hematology, and clinical chemistry parameters were measured. Microscopic examinations were performed on routine H&E slide preparations. Male and female SRG displayed lower mean body weight when compared to sex- and age-matched CD. Compared to CD, SRG had reduced lymphoid tissue and circulating monocytes, and highly reduced circulating lymphocytes, neutrophils, eosinophils, and basophils; expected phenotypes for this severely immunodeficient rat. Thymus was not present in SRG rats, spleens were grossly smaller, and bone marrow cellularity was decreased compared to CD. Microscopically, mandibular lymph nodes and lymphoid tissue in spleen, lung, and intestine were not observed in SRG rats, consistent with the 92% decrease in circulating lymphocytes. To demonstrate the utility of the SRG for tumor inhibition, pharmacokinetics, and pharmacodynamics, we inoculated rats with human VCaP prostate cancer cell-derived tumors, then treated these animals and collected serial blood samples and tumor biopsies to assess tumor biomarkers. Treatment led to decreased PSA and AR, two key proteins expressed in prostate cancer, correlating to decreased tumor growth. These data demonstrate that the SRG rat is suitable for toxicology studies and has comparable pathology to the CD rat, except for reduced lymphoid tissue and WBCs, which are expected phenotypes. In addition, the SRG rat supports the growth of human cancer tissue for treatment studies. The large size of the SRG rat and comparative pathology to the CD rat support its value as an immunodeficient model for assessing toxicity during efficacy testing for de-risking safety concerns in the presence of the human target tissue. Citation Format: Diane Begemann, Cynthia Dunn, Darrell Robertson, Lauren Keach, Emily Baldwin, R. Grace Walton, Alex Van Engelenburg, Jessica Durrant, Laura Healy, Koh Meng Aw Yong, Michael J. Schlosser, Fallon K. Noto. Utility of the highly immunodeficient SRG rat for combined drug efficacy, pharmacokinetics, and toxicology studies in tumor-bearing animals [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 1 (Regular Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(6_Suppl):Abstract nr 4183.

Retropharyngeal manifestation of T-cell-rich B-cell lymphoma in a 7-year-old Icelandic gelding

A 7-year-old Icelandic gelding was presented with acute severe dyspnea of one day duration and purulent nasal discharge that had been present for 6 weeks. Clinically, the initial examination focused on severe enlargement of the mandibular and retropharyngeal lymph nodes as well as a mixed dyspnea.The diagnosis of a malignant lymphoma was evident following laboratory diagnostics, endoscopy, and cytological examination of a fine needle aspiration of a mandibular lymph node. The gelding was euthanized due to the poor prognosis and a significantly disturbed general condition. Pathohistological examination revealed a multicentric T-cell-rich B-cell lymphoma.

Unusual course of mastitis in the mare in the course of strangles resulting in autoamputation of the mammary gland – a case report

Inflammation of the mammary gland (mastitis) is not a common disease in mares. Moreover, abscessation of the mammary gland is rare, and the pathogenesis of abscessation is not fully understood. As a rule, in such cases, intensive antibiotic therapy is required, combined with the rinsing of the abscess, and in cases of botryomycosis, the mammary gland must be surgically removed. The case described here concerns a six-yearold mare with right-sided mastitis and typical signs caused by Streptococcus equi subsp. zooepidemicus and Streptococcus equi subsp. equi. The bacteria were sensitive to a number of antibiotics, including penicillin. Before the results of microbiological examination were obtained, the mare was treated with sulfamerazine 25 g/day, trimethoprim 5 g/day (per os) and gentamicin at a dose of 5.5 mg/kg (i.v.), as well as with nonsteroidal anti-inflammatory drugs. Despite the treatment, the mare’s condition began to deteriorate (loss of appetite, leukocytosis, enlargement and rupture of the mandibular lymph nodes, reluctance to move and cracking of the udder skin with purulent discharge). Then, procaine penicillin was administered at a dose of 6000 mg/day i.m. The mare’s condition began to improve, but large amounts of pus continued to ooze from the cracks in the skin of the udder, and on the sixteenth day after penicillin administration, the affected part of the gland underwent spontaneous autoamputation. Inspection of the wound after the autoamputation of the right part of the mammary gland showed no remains of abnormal tissue. The etiological agent and the signs of the disease indicate that an abscess of the right side of the mammary gland was formed in the course of strangles. The formation of abscesses in various parts of the body, including the mammary gland, is not unusual in the course of strangles. What is unusual, however, is the autoamputation of the mammary gland. The mare was discharged home within a few days of the autoamputation, and no further complications were reported.

The diagnostic yield of preoperative screening for oral cancer in dogs over 15 years, part 1: locoregional screening.

Determine locoregional diagnostic yield of 4-site screening (head, neck, chest, and abdomen) to diagnose metastatic disease or clinically significant comorbid diseases in dogs with oral cancer. 381 dogs with histologically confirmed oral tumors. Medical records from 381 dogs with histologically confirmed oral tumors that underwent preoperative screening were retrospectively reviewed. Skull and neck CT scan was performed on 348 patients. Bone lysis was present in 74.4% of tumors. Oral squamous cell carcinoma, sarcomas, and T2-T3 (> 2 cm) tumors had a significantly (P < .05) increased incidence of lysis compared to odontogenic and T1 (< 2 cm) tumors, respectively. Minor incidental findings were present in 60.6% of CT scans. Major incidental findings were found in 4.6% of scans. The risk of diagnosing an incidental finding increased by 10% and 20% per year of age for minor and major findings, respectively. Lymph node metastasis was diagnosed with CT or cytology in 7.5% of cases (10.7% of nonodontogenic tumors, 0% of odontogenic tumors). Oral malignant melanoma, oral squamous cell carcinoma, and T3 tumors had the highest prevalence of metastatic disease at the time of staging. The presence of bone lysis was not associated with cervical metastasis. Major incidental findings were rare (< 5%) but primarily included secondary extraoral tumors. Lymphatic metastasis was diagnosed in 10.7% of nonodontogenic tumors, but cytology was not performed in the majority of cases and often included only a single mandibular node. Therefore, these results likely underestimate the incidence of lymphatic metastasis. Guided lymph node sampling is highly recommended, especially for oral malignant melanoma, squamous cell carcinoma, and T2-T3 tumors.

Tomographic evaluation of the glands and lymph nodes of the cervical region in the crab-eating fox (Cerdocyon thous).

The present study aimed to determine references of normality of computed tomographic (CT) images of mandibular and parotid salivary glands (PSGs), medial retropharyngeal and mandibular lymph nodes and thyroid gland of 10 clinically healthy crab-eating foxes, Cerdocyon thous. The location, shape, homogeneity of the parenchyma, and length, height, width and pre- and post-contrast attenuation values were evaluated. The anatomical structures in the crab-eating foxes studied here presented anatomical landmarks similar to those described for domestic dogs, and showed a regular shape and homogenous parenchyma, except for the PSGs, that showed predominantly heterogeneous parenchyma. The thyroid gland topography in the crab-eating fox, though very similar, is not identical to the domestic dog and the presence of isthmus between the lobes was not detected. The values obtained from crab-eating foxes are within the normal range, although in the upper limits of dogs. There was a significant difference in the attenuation values between the right and left lobes of the thyroid gland, being greater in the left thyroid lobe. CT attenuation values ranges for this neotropical canid can be incorporated into routine staging procedures in the veterinary care of the crab-eating foxes. Furthermore, the CT images obtained were similar to those of healthy dogs, and the information obtained can be considered as initial tomographic references of normality in the cervical structures of the crab-eating fox, in order to aid in the diagnosis of future diseases that can affect this neotropical canid.

Ameloblastic fibro-odontosarcoma with mandibular bone invasion and regional lymph node metastasis in a cat: case report

Odontogenic tumours are uncommon neoplasms in domestic animals, mostly solitary and locally infiltrative, but rarely metastatic. We report the case of a 13-year-old neutered male cat presented with a mandibular gingival neoformation. A computed tomography scan revealed an irregular neoformation with marked post-contrast enhancement, associated with lysis of the incisive bone and mandibular symphysis. Histologically, the oral mucosa and mandibular bone were infiltrated by a neoplasm consisting of a mixed population of odontogenic epithelium admixed with bundles of odontogenic ectomesenchyme, multifocally associated with hard tissue deposition. A spindloid cell component had metastasized to the right mandibular lymph node. The epithelial component was immunoreactive for cytokeratins (CK) 5/6, CK 14, pancytokeratin (CK AE1/AE3) and p63; the ectomesenchymal component was vimentin positive. A final diagnosis of ameloblastic fibro-odontosarcoma with bone invasion and lymph node metastasis was made. The findings indicate the metastatic potential of this rare tumour.

Eyelid and conjunctival mast cell tumors: A retrospective study of 26 dogs and 8 cats.

The objective of the study was to describe clinical and histologic characteristics of eyelid (LMCT) and conjunctival (CMCT) mast cell tumors in dogs and cats presented to a referral clinic in Germany. Medical records were reviewed to identify dogs and cats diagnosed with LMCTs or CMCTs between 2006 and 2020. LMCT were diagnosed in 31 patients and were cutaneous (n = 28; 20 dogs and 8 cats) or subcutaneous (three dogs). Five cases involved the mucocutaneous junction (four dogs, one cat). CMCTs occurred only in dogs (n = 3). At the time of presentation two of the four canine LMCT cases involving the mucocutaneous junction had metastasized to a mandibular lymph node. When applying the Kiupel system, both these cases were categorized as high grade. 85.7% (18/21) of the canine (19 cutaneous and 2 subcutaneous) LMCT and all CMCT cases were categorized as Kiupel low grade. No local recurrences occurred in all LMCT cases in which clean surgical margins were obtained (n = 18, mean surgical margin width: dogs 9.4 mm, cats 3.8 mm). Two cats (2/4) and four dogs (4/7) with questionable or incomplete surgical margins experienced local recurrences (mean time to recurrence of 180 and 637 days in dogs and cats, respectively). Recurrence of low-grade LMCTs and CMCTs following excision with clean margins is rare. Tumors involving the mucocutaneous junction may be of higher grade and prone to lymphatic metastasis.

Dynamic Correlations and Disorder in the Masticatory Musculature Network.

Temporomandibular joint (TMJ) disorders, which affect millions of people worldwide, have multiple etiological factors that make an accurate diagnosis and effective treatments difficult. As a consequence, the gold standard diagnostic criteria for TMJ disorders remain elusive and often depend on subjective decisions. In this context, the lack of a non-invasive quantitative methodology capable of assessing the functional physiological state and, consequently, identifying risk indicators for the early diagnosis of TMJ disorders must be tackled and resolved. In this work, we have studied the biomechanics and viscoelastic properties of the functional masticatory system by a non-invasive approach involving 52 healthy subjects, analysed by statistical-physics analysis applied to myotonic measurements on specific points of the masticatory system designing a TMJ network composed of 17 nodes and 20 links. We find that the muscle tone and viscoelasticity of a specific cycle linking frontal, temporal, and mandibular nodes of the network play a prominent role in the physiological functionality of the system. At the same time, the functional state is characterised by a landscape of nearly degenerated levels of elasticity in all links of the network, making this parameter critically distributed and deviating from normal behaviour. Time evolution and dynamic correlations between biomechanics and viscoelastic parameters measured on the different cycles of the network provide a quantitative framework associated with the functional state of the masticatory system. Our results are expected to contribute to enriching the taxonomy of this system, primarily based on clinical observations, patient symptoms, and expert consensus.

UNILATERAL RHINITIS AND HEMOBARTONELLA FELIS INFECTION IN DOMESTIC CATS WITH A HISTORY OF CHRONIC KIDNEY DISEASE

Rhinitis is an inflammation of the mucous membranes of the nasal cavity, which can arise from a number of intranasal or systemic disorders. Hemobartonella felis is a gram-negative intracellular bacterium that attacks cat's erythrocytes. This treatment aims to discuss diagnostic and treatment techniques for rhinitis and Hemobartonellosis infection in cat with kidney failure. The animal is a local cat with a history of kidney failure, female, 6 years old and weighing 2.7 kg. The owner came with complaints of a serous discharge in the right nasal cavity and occasional sneezing. The cat has decreased appetite since 6 months and looks weak. Clinical examination showed swelling of the right mandibular lymph nodes and inspection of the oral cavity found gingivitis, tartar, and halitosis. Routine hematological examination results showed that the cat had macrocytic hypochromic anemia accompanied by thrombocytopenia. Examination of the blood smear preparations found coccoid formations with short chains or rod formations in the cat's erythrocytes which indicated a positive result for Hemobartonella felis. Case animal was diagnosed with unilateral rhinitis and Hemobartonella felis infection. The therapy given consisted of Doxycycline antibiotics at a dose of 10 mg/kg once a day for 14 days, anti-inflammatory Dexamethasone at a dose of 0.5 mg once a day for 5 days and Sangobion as a supportive therapy 1 capsule once a day for 10 days. The therapy given helps to improve the condition of the case animal. General check up of health conditions is required during the maintenance period.

개에서 비장종괴

Tumors of the spleen often occur in middle-aged dogs and can range from benign to malignant. Maltese, a 13-year-old neutered dog, visited the hospital with several vomiting and loss of appetite that lasted intermittently for about 2 months. There was no problem with the dog's consciousness, walking was normal, and mandibular and popliteal lymph nodes were normal in size and no abnormality was observed. Ultrasonography revealed a mass in the spleen, and the spleen was removed through splenomegaly. Histological examination concluded that the spleen was a hematoma. The hematoma is 6 × 6 × 6 cm in size, and histologically, it is not encapsulated inside the spleen parenchyma, but a nodule with clear borders is formed. The inside of the nodule is mostly composed of red blood cells, dilated blood vessels, and macrophages containing hemoglobin. It is identified as a hematoma originating inside the spleen.

Lymphotropic nanoparticle magnetic resonance imaging for diagnosing metastatic lymph nodes in dogs with malignant head and neck tumours.

Lymphotropic nanoparticle magnetic resonance imaging (LNMRI) utilises ultrasmall paramagnetic iron nanoparticles (USPIOs) for imaging of metastatic lymph nodes in patients afflicted with cancer. LNMRI has been shown to be a highly effective and accurate way to diagnose metastasis in humans but has not been commonly reported on in veterinary medicine. USPIOs are phagocytised by macrophages and then localised to lymph nodes where they create a susceptibility artefact on gradient echo MRI sequences. In this study dogs (n = 24) with naturally occurring head and neck tumours were imaged with LNMRI then had mandibular and retropharyngeal lymph nodes extirpated for histological analysis. Subjective and objective analysis of the LNMRI images was performed and imaging results compared to histology as the gold standard. A total of 149 lymph nodes were included in this study. The overall sensitivity, specificity and accuracy was 64%, 94.4% and 89.3% respectively. However, if dogs with mast cell tumours were excluded from analysis the sensitivity, specificity and accuracy rose to 85.7%, 95.7% and 94.6%. LNMRI is potentially an accurate way to determine the presence of lymph node metastasis in dogs with some types of head and neck tumours. However, LNMRI has only moderate accuracy in dogs with oral or mucocutaneous mast cell tumours in this region.

Pathomorphological changes in the organs of the peripheral immune system in mycobacteriosis of cattle

Conducting routine allergy tests of cattle with a simultaneous sample in TB-prone farms is necessary to confirm the stage of the epizootic process. The purpose of the research – to explore the pathomorphological changes in cows upon detection of para allergic reactions during diagnostic testing for tuberculosis. The diagnosis of tuberculosis in animals was performed comprehensively using all methods for tuberculosis control provided for in the guidelines – epidemiological, clinical, allergic, pathological, histomorphological, bacteriological and biological. It allowed establishing that the reactions to tuberculin in cows were of a paraallergic nature, caused by nontuberculous mycobacteria or so-called atypical mycobacteria. It was determined that cows that reacted positively to tuberculin and an atypical mycobacterial allergen and were sent for slaughter for diagnostic purposes did not demonstrate pathological changes characteristic of tuberculosis. However, pathological changes (granulomatous foci, atrophy of lymphoid and epithelioid tissue, hyperplasia of varying intensity and nature, dotted haemorrhages in the cortical zone) were observed in many lymph nodes, including mediastinal, mesenteric, pharyngeal and mandibular lymph nodes, indicating an active infectious process in the body of animals caused by nontuberculous mycobacteria. Therewith, several changes were observed in the lymph nodes during histomorphological examination: development of primary nodules of lymphocytes and reticular tissue in reactive centres, degradation and necrosis of lymphocytes, the establishment of cellular detritus in the centre of the nodules and capsules of epithelioid elements around the nodules, etc., which can be used to confirm the patterns of pathology development and, indirectly, the mechanism of sensitisation of the cow’s body, and therefore the nature of paraallergic reactions in animals. The obtained results are important for the timely detection and identification at the histomorphological level of a complex of changes in the organs and tissues of cows due to the penetration of nontuberculous mycobacteria, which is the key to the successful diagnosis of primary foci of mycobacteriosis and their effective prevention