著者

Kazuhiro KOJIMA James K. CHAMBERS Ayano ISHII Kazuhito SEGAWA Kazuyuki UCHIDA

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.21-0579, (Released:2021-12-27)

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An 8-year 8-month-old castrated male Munchkin presented with vomiting, anorexia and hypoactivity. Computed tomography revealed excessive gas accumulation within the intestinal lumen and gas bubbles in the liver, spleen, and portal venous system, indicating hepatic portal venous gas. The cat died without any significant improvement, and mild splenomegaly was found at necropsy. Histologically, multiple gas vacuoles were diffusely observed in the liver and spleen. In the stomach, multiple gas vacuoles and scattered focal ulcers were detected within the mucosa. Multifocal hemorrhage was noted in the small and large intestines, whereas gas vacuoles were not present. Based on these findings, a gastric ulcer under high gas pressure may have provided an entry point for gas into the portal venous system.

著者

Takuro NAGAHARA Koichi OHNO Itsuma NAGAO Taisuke NAKAGAWA Yuko GOTO-KOSHINO Masaya TSUBOI James K. CHAMBERS Kazuyuki UCHIDA Hirotaka TOMIYASU Hajime TSUJIMOTO

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.21-0363, (Released:2021-12-01)

被引用文献数

1

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Intestinal lymphangiectasia (IL) is a common complication in dogs. Since nitric oxide (NO) is known to relax the lymphatic duct, we evaluated inducible NO synthase (iNOS) expression using immunohistochemistry in 13 dogs with lymphoplasmacytic enteritis (LPE) with or without IL. The duodenal iNOS expressing cells were significantly increased in dogs with IL-negative or IL-positive LPE dogs (P=0.025, P=0.007) compared with control dogs. However, there was no significant difference in iNOS expression between IL-positive and IL-negative tissues. Based on these results, there is no clear evidence for the NO overproduction in the pathogenesis of IL in dogs with LPE. Factors other than NO could, thus, contribute to IL in dogs with LPE.

著者

Rikako ASADA Yuji HAMAMOTO Yoshihiko YU Satoshi MIZUNO James K. CHAMBERS Kazuyuki UCHIDA Daisuke HASEGAWA

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.21-0127, (Released:2021-08-18)

被引用文献数

5

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Anterior temporal lobectomy (ATL) is a surgical procedure for drug-resistant mesial temporal lobe epilepsy that is commonly performed in human medicine. The purpose of this study was to determine whether ATL-like surgery, i.e., removal of the amygdala and hippocampal head, is possible in dogs, and to investigate its safety and postoperative complications. Eight healthy beagles underwent ATL-like surgery and were observed for 3 months postoperatively. Samples from the surgically resected tissues and postmortem brain were evaluated pathologically. The surgical survival rate was 62.5%. The major postoperative complications were visual impairment, temporal muscle atrophy on the operative side, and a postoperative acute symptomatic seizure. Due to the anatomical differences between dogs and humans, the surgically resected area to approach the medial temporal structures in dogs was the ventrolateral part of the temporal lobe. Therefore, the ATL-like surgery described in this study was named “ventrolateral temporal lobectomy” (VTL). This study is the first report of temporal lobectomy including amygdalohippocampectomy in veterinary medicine and demonstrates its feasibility. Although it requires some degree of skill, VTL could be a treatment option for canine drug-resistant epilepsy and lesions in the mesial temporal lobe.

著者

Takuro NAGAHARA Koichi OHNO Itsuma NAGAO Taisuke NAKAGAWA Nozomu YOKOYAMA Aki OHMI Yuko GOTO-KOSHINO James K. CHAMBERS Kazuyuki UCHIDA Hirotaka TOMIYASU Hajime TSUJIMOTO

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.21-0137, (Released:2021-06-28)

被引用文献数

1

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Protein-losing enteropathy (PLE) is known to induce hypercoagulability and resultant thromboembolism in dogs. We hypothesized that hypercoagulability would improve if remission was obtained in dogs with PLE after treatment. This study aimed to evaluate the changes in the coagulation parameters after treatment in dogs diagnosed with PLE. As coagulation parameters, prothrombin time (PT), activated partial thromboplastin time (aPTT), fibrinogen, thrombin-antithrombin complex (TAT), D-dimer, and antithrombin (AT) were measured. In addition to these parameters, rotational thromboelastometry (ROTEM), which evaluates the comprehensive coagulation and fibrinolysis reactions of whole blood, was conducted and the data of clotting time (CT), clot formation time (CFT), α angle (α), maximum clot firmness (MCF) and lysis index at 60 min (LI60) were obtained. Eleven of the 14 dogs diagnosed with PLE were classified as responders to the treatment based on the changes in their plasma albumin (ALB) concentration after treatment. Significant increase in CFT and decrease of α and MCF indicating the resolution of hypercoagulability were found after treatment in responder dogs; however, there was no significant change in the coagulation and fibrinolysis parameters other than those measured by ROTEM. This study demonstrated that the hypercoagulability detected by ROTEM was significantly improved after treatment in dogs with PLE.

著者

Makiko OZAWA Mai INOUE Kazuyuki UCHIDA James K. CHAMBERS Yukari TAKEUCH Hiroyuki NAKAYAMA

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.19-0458, (Released:2019-11-01)

被引用文献数

20

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Physical disturbances are common in dogs with canine cognitive dysfunction (CCD). However, the relation between these physical disturbances and CCD has not been clarified. The aim of this study was to clarify the physical disturbances in CCD by questionnaire survey. The questionnaire consisted of items of general information, physical disturbances (gait and posture abnormalities, and deteriorating perception) and a CCD assessment scale named the CCD rating scale (CCDR). The survey was conducted toward owners of dogs aged 10 years or older in two ways: A web-based (Web survey) and a paper-based (Paper survey) survey. To determine which physical disturbances were associated with CCD, ordinal logistic regression analyzes were performed. Through the Web survey, 726 valid responses were obtained, and the test results revealed that vision impairment, smell disturbance, tremor, swaying or falling and head ptosis were significantly associated with CCD. These items, except for head ptosis, were also significantly associated with, or tended to be associated with, CCD in 103 valid responses to the Paper survey. The prevalence of CCD was increased in the elderly dog population, especially in dogs aged 16 years or older. In contrast, physical signs gradually increased from 10 years of age. These results suggest that physical disturbances may appear in the early stages of CCD. In conclusion, the present study revealed new clinical signs of CCD linked to physical disturbances and suggested that these signs could be useful for detecting early stage of CCD.

著者

Makoto NAKATA Yasutsugu MIWA James K. CHAMBERS Tsubasa SAITO Kazuyuki UCHIDA

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

vol.80, no.8, pp.1325-1328, 2018 (Released:2018-08-30)

参考文献数

17

被引用文献数

7

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A 14-month-old, female mini rex was referred for a detailed examination because of exercise intolerance with associated dyspnea. The thoracic radiograph demonstrated severe cardiac enlargement and elevation of the trachea. The echocardiography revealed dilatations of the right-side heart and pulmonary artery, and the color flow Doppler echocardiography demonstrated an atrial septum defect with left to right shunt, resulting in a disturbed flow. The rabbit died 19 days after the initial presentation, and a necropsy was performed. At the necropsy, a defect, 5 mm in diameter, was detected in the atrial septum. Based on the location of the defect, an ostium secundum type atrial septal defect was diagnosed. This is the first clinical report of atrial septal defect in rabbits.

著者

Nguyen V. SON James K. CHAMBERS Takanori SHIGA Takuya E. KISHIMOTO Shotaro KIKUHARA Kohei SAEKI Reina FUJIWARA Masaya TSUBOI Ryohei NISHIMURA Kazuyuki UCHIDA Hiroyuki NAKAYAMA

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

vol.80, no.7, pp.1125-1128, 2018 (Released:2018-07-12)

参考文献数

19

被引用文献数

8

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A 12-year-old intact male Welsh Corgi was presented with enlargement of the right scrotum. Both testicles were surgically removed and histopathologically examined. On gross examination, white nodules were found in the epididymis and ductus deferens. Histopathologically, the nodules developed continuously from the tunica vaginalis testis of the right scrotum and consisted of spindle-shaped neoplastic cells that invaded the surrounding tissue. Immunohistochemically, the neoplastic cells were diffusely positive for vimentin, cytokeratin and Wilms tumor-1 (WT-1). Based on these findings, the tumor was diagnosed as sarcomatoid mesothelioma. The dog presented with respiratory distress 122 days after surgery and clinical examination found multiple metastatic lesions in the lung, abdominal lymph nodes and peritoneum. The dog died 144 days after surgery due to disease progression.

著者

Takuya E. KISHIMOTO James K. CHAMBERS Kouki MIYAMA Nguyen V. SON Mun Keong KOK Mizuho UNEYAMA Yasutsugu MIWA Hiroyuki NAKAYAMA Kazuyuki UCHIDA

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

vol.80, no.10, pp.1511-1514, 2018 (Released:2018-10-10)

参考文献数

15

被引用文献数

1

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A hard palate mass was surgically removed from an Australian green tree frog (Litoria caerulea) and examined pathologically. The tumor consisted of sheets of small cells arranged in a tubular structure and cords or rosettes with fibrovascular stroma. Immunohistochemically, neoplastic cells were diffusely positive for cytokeratin and neuron-specific enolase and partially positive for S-100 and doublecortin. These findings indicate that the tumor originated from the neuroectodermal tissue. Based on these findings, the tumor was classified as a neuromastoma (neuroepithelioma). Sensory cells located in the hard palate of the frog were considered to be the origin of the tumor. The frog died after going through 3 surgeries and experiencing difficulties closing its mouth.

著者

Satoko SUGIMOTO Shingo MAEDA Masaya TSUBOI Kohei SAEKI James K. CHAMBERS Tomohiro YONEZAWA Kenjiro FUKUSHIMA Reina FUJIWARA Kazuyuki UCHIDA Hajime TSUJIMOTO Naoaki MATSUKI Koichi OHNO

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

vol.80, no.6, pp.874-877, 2018 (Released:2018-06-06)

参考文献数

18

被引用文献数

2

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A 6-year 5-month-old spayed female Scottish Fold cat presented with a one-month history of gait abnormalities, increased salivation, and decreased activity. A blood test showed hyperammonemia and increased serum bile acids. Imaging tests revealed multiple shunt vessels indicating acquired portosystemic shunt. Histopathologic analysis of liver biopsy showed features consistent with liver hypoperfusion, such as a barely recognizable portal vein, increased numbers of small arterioles, and diffuse vacuolar degeneration of hepatocytes. These findings supported the diagnosis of primary hypoplasia of the portal vein/microvascular dysplasia, (PHPV/MVD). To our knowledge, this is the first case of feline PHPV/MVD that developed multiple acquired portosystemic shunts and presented with hepatic encephalopathy.

著者

Takanori SHIGA Seiichi OKUNO Kazuyuki UCHIDA James K. CHAMBERS Hiroyuki NAKAYAMA

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

vol.80, no.3, pp.480-484, 2018 (Released:2018-03-24)

参考文献数

18

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An 8-year-old male Japanese Shiba exhibited muscle wasting and a stiff gait. A low-amplitude myotonic discharge was recorded by needle electromyography (EMG). A histopathological examination on a tru-cut biopsy sample from the muscle revealed myofiber size variations. Internal nuclei and cytoplasmic vacuoles were observed in many fibers. A type 1 fiber predominance and many hybrid type fibers were observed immunohistochemically. On the basis of these EMG and histopathological findings, myotonic dystrophy (DM) was suspected as tentative diagnosis. The cytoplasm around the vacuoles was immunopositive for cytochrome c, tom 20, and SOD-1, suggesting that these vacuoles might occur within mitochondria. Collectively, these results indicate that a mitochondrial abnormality partly play the role on the pathogenesis of present case.

著者

Nguyen V. SON James K. CHAMBERS Takanori SHIGA Takuya E. KISHIMOTO Shotaro KIKUHARA Kohei SAEKI Reina FUJIWARA Masaya TSUBOI Ryohei NISHIMURA Kazuyuki UCHIDA Hiroyuki NAKAYAMA

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.18-0186, (Released:2018-05-23)

被引用文献数

8

---

A 12-year-old intact male Welsh Corgi was presented with enlargement of the right scrotum. Both testicles were surgically removed and histopathologically examined. On gross examination, white nodules were found in the epididymis and ductus deferens. Histopathologically, the nodules developed continuously from the tunica vaginalis testis of the right scrotum and consisted of spindle-shaped neoplastic cells that invaded the surrounding tissue. Immunohistochemically, the neoplastic cells were diffusely positive for vimentin, cytokeratin and Wilms tumor-1 (WT-1). Based on these findings, the tumor was diagnosed as sarcomatoid mesothelioma. The dog presented with respiratory distress 122 days after surgery and clinical examination found multiple metastatic lesions in the lung, abdominal lymph nodes and peritoneum. The dog died 144 days after surgery due to disease progression.

著者

Satoko SUGIMOTO Shingo MAEDA Masaya TSUBOI Kohei SAEKI James K. CHAMBERS Tomohiro YONEZAWA Kenjiro FUKUSHIMA Reina FUJIWARA Kazuyuki UCHIDA Hajime TSUJIMOTO Naoaki MATSUKI Koichi OHNO

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.17-0648, (Released:2018-04-09)

被引用文献数

2

---

A 6-year 5-month-old spayed female Scottish Fold cat presented with a one-month history of gait abnormalities, increased salivation, and decreased activity. A blood test showed hyperammonemia and increased serum bile acids. Imaging tests revealed multiple shunt vessels indicating acquired portosystemic shunt. Histopathologic analysis of liver biopsy showed features consistent with liver hypoperfusion, such as a barely recognizable portal vein, increased numbers of small arterioles, and diffuse vacuolar degeneration of hepatocytes. These findings supported the diagnosis of primary hypoplasia of the portal vein/microvascular dysplasia, (PHPV/MVD). To our knowledge, this is the first case of feline PHPV/MVD that developed multiple acquired portosystemic shunts and presented with hepatic encephalopathy.

著者

Takanori SHIGA Seiichi OKUNO Kazuyuki UCHIDA James K. CHAMBERS Hiroyuki NAKAYAMA

出版者

JAPANESE SOCIETY OF VETERINARY SCIENCE

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.17-0459, (Released:2018-01-02)

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An 8-year-old male Japanese Shiba exhibited muscle wasting and a stiff gait. A low-amplitude myotonic discharge was recorded by needle electromyography (EMG). A histopathological examination on a tru-cut biopsy sample from the muscle revealed myofiber size variations. Internal nuclei and cytoplasmic vacuoles were observed in many fibers. A type 1 fiber predominance and many hybrid type fibers were observed immunohistochemically. On the basis of these EMG and histopathological findings, myotonic dystrophy (DM) was suspected as tentative diagnosis. The cytoplasm around the vacuoles was immunopositive for cytochrome c, tom 20, and SOD-1, suggesting that these vacuoles might occur within mitochondria. Collectively, these results indicate that a mitochondrial abnormality partly play the role on the pathogenesis of present case.

著者

Hajime ASADA Masaya TSUBOI James K. CHAMBERS Kazuyuki UCHIDA Hirotaka TOMIYASU Yuko GOTO-KOSHINO Koichi OHNO Hajime TSUJIMOTO

出版者

公益社団法人 日本獣医学会

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.17-0197, (Released:2017-09-01)

被引用文献数

12

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Canine histiocytic sarcoma (HS) is a malignancy originating from the histiocytic cell lineage and characterized by poor response to chemotherapy and short survival time. Mutation of the TP53 gene and its association with poor prognosis has been reported in several canine tumors. However, the mutation of this gene has not been investigated in canine HS. The aim of this study was to examine a TP53 gene mutation in dogs with HS. Aberrations of the TP53 gene were examined by polymerase chain reaction-single strand conformational polymorphism analysis and DNA sequence analysis, revealing mutations of the TP53 gene in 12 (46%) of 26 dogs affected by HS. The incidence of the TP53 gene mutation was relatively high in canine HS compared with other canine tumors. Among these mutations, 10 of 12 dogs (83%) with a TP53 gene mutation harbored the same mutation: a 2-base (AT) insertion in exon 5, resulting in the introduction of a stop codon (c.446_447insAT, p.Tyr150SerfsX8). Further studies are needed to examine the functional change due to the mutation and its association with the pathogenesis of canine HS.

著者

Daiki KATO Mariko OISHI Koichi OHNO Ko NAKASHIMA Atsuhito WADA Shin-ichiro FUKUMOTO Tatsushi MORITA Soichi IMAI Masaya TSUBOI James K. CHAMBERS Kazuyuki UCHIDA Hajime TSUJIMOTO

出版者

公益社団法人 日本獣医学会

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

vol.79, no.8, pp.e1, 2017 (Released:2017-08-04)

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NOTE Internal Medicine The first report of the ante-mortem diagnosis of Ollulanus tricuspis infection in two dogs Daiki KATO1), Mariko OISHI1), Koichi OHNO1)*, Ko NAKASHIMA1), Atsuhito WADA1), Tatsushi MORITA2), Soichi IMAI2), Masaya TSUBOI3), James K. CHAMBERS3), Kazuyuki UCHIDA3) and Hajime TSUJIMOTO1) 1)Department of Veterinary Internal Medicine, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1–1–1 Yayoi, Bunkyo-ku, Tokyo 113–8657, Japan 2)Division of Veterinary Infectious Disease, Department of Veterinary Pathobiology, Nippon Veterinary and Life Science University, 1–7–1 Kyonanchyo Musashino, Tokyo 180–8602, Japan 3)Department of Veterinary Pathology, Graduate School of Agricultural Should have been NOTE Internal Medicine The first report of the ante-mortem diagnosis of Ollulanus tricuspis infection in two dogs Daiki KATO1), Mariko OISHI1), Koichi OHNO1)*, Ko NAKASHIMA1), Atsuhito WADA1), Shin-ichiro FUKUMOTO2), Tatsushi MORITA3), Soichi IMAI3), Masaya TSUBOI4), James K. CHAMBERS4), Kazuyuki UCHIDA4) and Hajime TSUJIMOTO1) 1),Department of Veterinary Internal Medicine, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1–1–1 Yayoi, Bunkyo-ku, Tokyo 113–8657, Japan 2)Laboratory of Veterinary Parasitology, Department of Pathobiology, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido 069-8501, Japan 3)Division of Veterinary Infectious Disease, Department of Veterinary Pathobiology, Nippon Veterinary and Life Science University, 1–7–1 Kyonanchyo Musashino, Tokyo 180–8602, Japan 4)Department of Veterinary Pathology, Graduate School of Agricultural

著者

Ken-ichi WATANABE James K. CHAMBERS Kazuyuki UCHIDA Kazumi NIBE Nanako USHIO Noriyuki HORIUCHI Yoshiyasu KOBAYASHI Hiroyuki NAKAYAMA

出版者

公益社団法人 日本獣医学会

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

vol.79, no.3, pp.670-673, 2017 (Released:2017-03-28)

参考文献数

10

被引用文献数

5

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The atypical cutaneous tumor of a 9-year-old mixed breed female dog was examined. The tumor was well-demarcated and histologically composed of a trichoblastic area, tricholemmal area and apocrine glandular area. Neoplastic cells in trichoblastic area and tricholemmal area had PAS-positive granules in the cytoplasm and were positive for pan-cytokeratin, cytokeratin 5/6, 14 and 19 and p63. Neoplastic cells in trichoblastic area were also positive for cytokeratin 15 and CD34. Neoplastic cells in apocrine glandular area were positive for pan-cytokeratin and cytokeratin 7, 18 and 19. Myoepithelial cell proliferation with osteocartilaginous metaplasia was observed in this area. Since neoplastic cells showed multiphenotypic differentiation for hair follicles and apocrine glands, the present case was diagnosed as a cutaneous mixed tumor.

著者

Nanako USHIO James K. CHAMBERS Kennichi WATANABE Takuya E. KISHIMOTO Jun-You LI Hiroyuki NAKAYAMA Kazuyuki UCHIDA

出版者

公益社団法人 日本獣医学会

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

vol.78, no.8, pp.1373-1375, 2016 (Released:2016-09-01)

参考文献数

15

被引用文献数

1

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A 7-year-old Duroc sow exhibited emaciation, loss of appetite and rapid breathing, and was euthanized. Histopathological examination revealed mild to moderate fibrosis of the heart, cystic kidneys and ulcerative enteritis associated with Balantidium infection. Additionally, a small nodule was incidentally found in the peripancreatic fat tissue. The nodule consisted of disarranged cellular components: pancreatic islet cells (either insulin-, glucagon- or somatostatin-positive), pancreatic acinar cells, hepatocytes (human hepatocyte-positive) and ductal cells (cytokeratin 19-positive). Some of the human hepatocyte-positive cells were also positive for chromogranin A and cytokeratin 7, indicating that they were hepatic progenitor cells. The nodule was therefore diagnosed as hamartoma, probably originating from a fragment of the caudal verge of the liver bud, which contains hepatic and pancreatic progenitors.

著者

Mun Keong KOK James K. CHAMBERS Atsushi DOHATA Kazuyuki UCHIDA Ryohei NISHIMURA Hiroyuki NAKAYAMA

出版者

公益社団法人 日本獣医学会

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.17-0178, (Released:2017-05-01)

被引用文献数

4

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A 10-year-old mixed breed dog was presented with a 0.8 cm diameter mass below the left eye region. The mass was surgically removed and processed for histopathological examination. Microscopically, tumor cells proliferated in small lobules, nests and cords, and the tumor parenchyma was separated by desmoplastic stroma. Majority of the tumor cells were periodic acid-Schiff (PAS)-positive, and the desmoplastic stroma was densely collagenous and mucinous. Immunohistochemical results showed that the tumor cells were diffusely positive for cytokeratin 15, cytokeratin 19 and CD 34, while cytokeratin 8 reactivity was limited to the tumor cells proliferating in cords. Few tumor cells were positive for nestin. Based on the histopathological findings, the tumor was diagnosed as desmoplastic tricholemmoma.

著者

Ken-ichi WATANABE James K. CHAMBERS Kazuyuki UCHIDA Kazumi NIBE Nanako USHIO Noriyuki HORIUCHI Yoshiyasu KOBAYASHI Hiroyuki NAKAYAMA

出版者

公益社団法人 日本獣医学会

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.16-0610, (Released:2017-01-28)

被引用文献数

5

---

The atypical cutaneous tumor of a 9-year-old mixed breed female dog was examined. The tumor was well-demarcated and histologically composed of a trichoblastic area, tricholemmal area and apocrine glandular area. Neoplastic cells in trichoblastic area and tricholemmal area had PAS-positive granules in the cytoplasm and were positive for pan-cytokeratin, cytokeratin 5/6, 14 and 19 and p63. Neoplastic cells in trichoblastic area were also positive for cytokeratin 15 and CD34. Neoplastic cells in apocrine glandular area were positive for pan-cytokeratin and cytokeratin 7, 18 and 19. Myoepithelial cell proliferation with osteocartilaginous metaplasia was observed in this area. Since neoplastic cells showed multiphenotypic differentiation for hair follicles and apocrine glands, the present case was diagnosed as a cutaneous mixed tumor.

著者

Atigan THONGTHARB Kazuyuki UCHIDA James K. CHAMBERS Yumiko KAGAWA Hiroyuki NAKAYAMA

出版者

公益社団法人 日本獣医学会

雑誌

Journal of Veterinary Medical Science (ISSN:09167250)

巻号頁・発行日

pp.15-0627, (Released:2015-12-12)

被引用文献数

26

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Histiocytic sarcoma is a progressive and fatal malignant neoplasm that mainly occurs in middle- to old-aged dogs. This study describes clinicopathological, histological and immunohistochemical characteristics of intracranial histiocytic sarcomas in 23 dogs. Magnetic resonance imaging and/or computed tomography of the brains revealed that the tumors mainly located in the cerebrum, particularly the frontal lobe. Seizure was a predominant clinical sign in most of the cases. Histologically, the tumor cells were morphologically classified into round/polygonal- and spindle-shaped cell types. There was a significant association between tumor cell types and hemophagocytic activity (P<0.05). However, there was no significant difference in other clinicopathological parameters and mitotic index between the 2 types. Immunohistochemically, tumor cells were strongly positive for HLA-DR, Iba-1 and CD204 in all the 23 cases, for iNOS in 20, for CD163 in 17, for lysozyme and CD208 (DC-LAMP) in 9, and for S100 in 5 cases. In addition, the Ki67-proliferative index showed range of 0.50–64.33% (Average 26.60 ± 3.81%). These observations suggest that canine primary intracranial histiocytic sarcomas tend to exhibit both dendritic cell and macrophage phenotypes of histiocytic differentiation.