Achados radiográficos e ultrassonográficos de fibrossarcoma em membro torácico de gatos: relato de três casos / Radiographic and ultrasound findings of fibrosarcoma in the cats: reports of three cases / Hallazgos radiográficos y ultrasonidos de fibrosarcoma en la extremidad torácica de gatos: informe de tres casos

O fibrossarcoma é uma neoplasia mesenquimal maligna originada dos fibroblastos que localiza-se especificamente em tecido cutâneo, subcutâneo e cavidade oral. A ressecção cirúrgica do tumor com margem de segurança é conhecida como a principal forma de tratamento. A principal forma de metástase é a via hematógena, atingindo pulmões, e menos comum em linfonodos regionais. A análise histopatológica é o exame diagnóstico de eleição para definição do tipo de tumor e sua graduação. Os exames de imagem são fundamentais no estadiamento das neoplasias e planejamento cirúrgico. A ultrassonografia e radiografia são os métodos mais utilizados e oferecem um grande apoio a oncologia médica veterinária. O exame radiográfico possibilita o achado de neoformações ósseas ou demais alterações como o aumento de volume de tecidos moles, infiltração gordurosa, e cavitações com gás ou fluído. O exame ultrassonográfico permite o conhecimento sobre a ecotextura, organização, e localização da lesão em tecidos moles. Em três gatos com fibrosssarcoma em membro torácico, foram realizadas radiografia e ultrassonografia específica da lesão. Os achados radiográficos foram aumento de volume, radiopacidade dos tecidos moles, sem acometimento ósseo. Os achados ultrassonográficos foram lesões de ecotextura grosseira, altamente heterogêneas. Os exames citológicos e histopatológicos revelaram tratar-se de fibrossarcoma. O presente relato tem como objetivo descrever os achados radiográficos e ultrassonográficos de fibrossarcoma em membro torácico de três gatos.

Fibrosarcoma is a malignant mesenchymal neoplasm originating from fibroblasts, which is specifically located in the skin tissue, subcutaneous tissue and oral cavity. Surgical resection of the tumor with a safety margin is known as the main form of treatment. The main form of metastasis is the hematogenous route, reaching the lungs, and less common in regional lymph nodes. histopathological analysis is the diagnostic test of choice for defining the type of tumor and its graduation. Imaging exams are essential in the staging of neoplasms and surgical planning. Ultrasonography and radiography are the most used methods and offer great support to veterinary medical oncology. The radiographic exam allows the finding of bone neoformations or other alterations such as the increase in soft tissue volume, fatty infiltration, and cavitations with gas or fluid. The ultrasound examination allows knowledge about the echotexture, organization, and location of the soft tissue lesion. Three cats with fibrosarcoma in the thoracic limb underwent lesion-specific radiography and ultrasound. The radiographic findings of fibrosarcomas were increased soft tissue radiopacity volume, without bone involvement. And the ultrasonographic findings were gross echotexture lesions, highly heterogeneous. Cytological and histopathological examinations were performed for definitive diagnosis. The present report aims to describe the radiographic and ultrasonographic findings of fibrosarcoma in the thoracic limb of three cats.

RESUMEN El fibrosarcoma es una neoplasia mesenquimatosa maligna que se origina a partir de fibroblastos, que se localiza específicamente en el tejido cutáneo, tejido subcutáneo y cavidad oral. La resección quirúrgica del tumor con un margen de seguridad se conoce como la forma principal de tratamiento. La principal forma de metástasis es la vía hematógena, que llega a los pulmones y es menos común en los ganglios linfáticos regionales. El análisis histopatológico es la prueba diagnóstica de elección para definir el tipo de tumor y su graduación. Los exámenes por imágenes son esenciales en la estadificación de las neoplasias y la planificación quirúrgica. La ecografía y la radiografía son los métodos más utilizados y ofrecen un gran apoyo a la oncología médica veterinaria. El examen radiográfico permite encontrar neoformaciones óseas u otras alteraciones como aumento de volumen de tejidos blandos, infiltración grasa y cavitaciones con gas o líquido. El examen ecográfico permite conocer la ecotextura, organización y ubicación de la lesión de tejidos blandos. A tres gatos con fibrosarcoma en la extremidad torácica se les realizó una radiografía y una ecografía específicas de la lesión. Los hallazgos radiográficos de los fibrosarcomas fueron un aumento del volumen de radiopacidad de los tejidos blandos, sin afectación ósea. Y los hallazgos ecográficos fueron lesiones macroscópicas de ecotextura, muy heterogéneas. Se realizaron exámenes citológicos e histopatológicos para el diagnóstico definitivo. El presente informe tiene como objetivo describir los hallazgos radiográficos y ecográficos del fibrosarcoma en la extremidad torácica de tres gatos.

Unusual Malignant Solid Neoplasms of the Kidney: Cross-Sectional Imaging Findings

Malignant kidney neoplasms are the most frequently encountered solid kidney masses. Although renal cell carcinoma is the major renal malignancy, other solid malignant renal masses should be considered in the differential diagnosis of solid renal masses that do not contain a macroscopic fatty component. In this pictorial essay, we present the imaging findings of a primitive neuroectodermal tumor, primary liposarcoma of the kidney, primary neuroendocrine tumor, leiomyosarcoma, synovial sarcoma, malignant fibrous histiocytoma, sclerosing fibrosarcoma and renal metastasis of osteosarcoma.

[Possibility of production of a novel radiopharmaceutical for identification of hypoxic tissues]

Hypoxia is an important determinant for biological behavior of malignant solid tumors. In vitro and in vivo studies have shown that tumor hypoxia is associated with an increased likelihood of local recurrence and distant metastasis, as well as resistance to radiation therapy and certain types of chemotherapy. Studies have shown that some copper-bis thiosemicarbazones especially, Cu-ATSM accumulates avidly in hypoxic cells, but washes out rapidly from normoxic cell. [[61]Cu]-diacetyl-bis [N4-methylthiosemicarbazone] [[61]Cu]-ATSM] was prepared using house-made ATSM ligand and [[61]Cu]CuCl[2] produced via the [nat]Zn[p,x] [61]Cu [180[1/4]A proton irradiation, 22MeV, 3.2h] and purified by ion chromatography method. [[61]Cu]-ATSM was administered into normal and tumor bearing rodents up to 180 minutes followed by biodistribution and co-incidence imaging studies. Radionuclidic control showed the presence of 67.41[4.23%], 282.96[12.2%], 373[2.15%], 511[122.9%], 656[10.77%], 1186[3.75%] keV-rays from [61]Cu and showed a radionuclidic purity higher than 99%. The rest of activity was attributed to [61]Cu [0.23%]. [[61]Cu]-ATSM radiochemical purity was >99% shown by HPLC and RTLC methods. A significant difference was observed between tumor and non tumor accumulation. The method used in this research for the production and chemical separation of 61Cu was simple and cost effective. [[61]Cu]-ATSM is PET radiopharmaceutical for hypoxia imaging with an intermediate half life, and our experiments on this radiopharmaceutical have shown satisfactory results, suitable for future PET studies in human

Tissue uptakes of 67Ga-bleomycin and carrier free 67Ga in fibrosarcoma - bearing mice

67Gallium-bleomycin complex [67Ga-BLM] was prepared using Thakour method. Radio-thin-layer-chromatography of prepared complex showed A2 and B2 radiopeaks with Rf at 0.7 and 0.4 respectively with a purity of above% 95. Tissue uptake of 67Ga-BLM and 67GaCl3 in twelve tissues including tumor, blood, liver, lung, spleen, muscle, skin, heart, kidney, colon, colon content,bladder and the total body were counted by well counter at 1, 2, 4, 24 and 48 hours post injection of radiopharmaceuticals. Uptakes of tissues are expressed as percent injected dose per gram of tissue. The clearance rate of 67Ga-BLM was 1.75-1.95 times faster than 67GaCl3 at all time intervals. Bladder uptakes of 67Ga-BLM were highest among twelve tissues at 1,2 and 4 hours after injection, then falling rapidly after 24 and 48 hours. Blood uptake of 67Ga-BLM was lower than 67GaCl3 in all time intervals. Colon content uptake of 67Ga-BLM was highest among twelve tissues at 2 and 4 hours post injection. Tumor to tissue activity ratios were also calculated, showing an increase of tumor to blood and muscle ratios. Tumor to blood ratio increased from 0.3 at 1 hour to 5.3 at 48 hours. Activity ratio of muscle increased from 0.5 at 1 hour to 5.5 at 48 hours. Whole body counting of animals showed that effective half lives of 67Ga-BLM and 67GaCl3 were about 1 and 15 hours respectively, which renders faster excretion of 67Ga-BLM complex. Biodistribution data clearly indicates that prepared complex in comparison with carrier free 67Ga [67GaCl3] has two main advantages: 1] high tumor to soft tissue uptake ratio that make it suitable for tumor imaging, 2] faster excretion specially at first three hours post injection. In addition complex is stable in vitro and in vivo

Retroperitoneal Malignant Mesenchymoma: A Case of Mesenchymal Mixed Tumor with Osteosarcoma, Leiomyosarcoma, Liposarcoma and Fibrosarcoma

Malignant mesenchymoma is an interesting but very rare tumor in which malignant differentiation has occurred twice or more. We report a case of retroperitoneal malignant mesenchymoma consisting of osteosarcoma, leiomyosarcoma, liposarcoma and fibrosarcoma. Abdominal CT showed a large retroperitoneal mass with two separate and distinct parts, namely an area of prominent calcification and one of clearly enhancing solid components. The mass contained histologically distinct tumorous components with no histologic admixure at the interfaces. The densely calcified nodule corresponded to osteosarcoma, and the noncalcified clearly enhancing nodules to leiomyosarcoma, liposarcoma and fibrosarcoma.