Publications by authors named "Carlos M Oliveira"

Lynch syndrome is the most common cause of hereditary colorectal cancer. It usually develops asymptomatically until symptoms related to colorectal carcinoma appear, such as gastrointestinal bleeding, abdominal pain, and changes in bowel habits and/or stool characteristics. Oftentime, when these clinical signs and symptoms are not present, the diagnosis becomes challenging.

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Rationale And Objectives: The objective of this study was to evaluate the ultrasound features of thyroid nodules and their association with malignancy, focusing on establishing feature-oriented ultrasound criteria to determine proper management of a thyroid nodule.

Materials And Methods: A sample of 379 thyroid nodules were biopsied (from a total of 357 patients aged 59.8 ± 14.

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Pancreatic dorsal agenesis (PDA) is a rare congenital anomaly, usually asymptomatic, that can present with abdominal pain, pancreatitis, diabetes mellitus and jaundice. Pancreatic tumours in PDA background are extremely rare, and when they occur are mainly pancreatic ductal adenocarcinoma. We present a case of a 48-year-old female patient with incidental detection of a 26×20 mm nodular lesion of the cephalic pancreas on ultrasound.

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In this work we propose a novel method for identifying individuals based on retinal fundus image matching. The method is based on the image registration of retina blood vessels, since it is known that the retina vasculature of an individual is a signature, i.e.

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  • Lymphoma in buffaloes was first noted in India during the 1960s, but recent studies show it may not be linked to the Bovine leukemia virus as previously thought.
  • Over a decade, four buffaloes in Brazil exhibited symptoms like weight loss and swollen lymph nodes, leading to necropsy findings that revealed tumor masses and B lymphocyte proliferation without the presence of BLV or Bovine herpesvirus 6.
  • The research marks the first report of lymphoma in Brazilian buffaloes as B-cell multicentric lymphoma, suggesting a potential association with Bovine immunodeficiency virus in one case, warranting further investigation.
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  • Enzootic bovine leucosis is caused by the Bovine leukemia virus (BLV), typically affecting cattle, where most are asymptomatic, but some develop lymphoma or persistent lymphocytosis.
  • A study in Brazil evaluated buffalo for BLV using various serum tests; while 24.44% tested seropositive via ELISA-BLV, all samples were negative in PCR tests.
  • The findings suggest that ELISA-BLV may produce false positives in buffalo and highlight the need for more accurate detection methods, as the singular case of lymphoma did not correlate with BLV infection.
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The essential oil of Plectranthus amboinicus and its chemotypes, carvacrol and thymol, were evaluated on the germination and root and aerial growth of Lactuca sativa and Sorghum bicolor and in acting on the cell cycle of meristematic root cells of L. sativa. The main component found in the oil by analysis in gas chromatography-mass spectrometry and gas chromatography flame ionization detection was carvacrol (88.

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  • Tuberculosis poses a significant threat to cattle production, causing economic losses and having a zoonotic potential.
  • A study in Pará, Brazil, tested 1140 buffaloes using a comparative cervical test (CCT), revealing 4.65% positive cases for tuberculosis, with additional inconclusive and negative results.
  • The findings suggest that CCT is an effective diagnostic tool, with good sensitivity (71.43%) and specificity (82.61%), indicating a low prevalence of Mycobacterium bovis among the tested buffaloes.
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  • The study investigated how thermal comfort indices and physiological parameters of buffalo bulls changed over time in a humid tropical climate during a five-month period.
  • Ten buffalo bulls were monitored for their respiratory rate, heart rate, rectal temperature, and semen quality, with assessments conducted monthly and bi-weekly.
  • Results showed that while some thermal comfort indices increased and varied throughout the day, the bulls managed to maintain their physiological and semen quality within normal ranges, indicating effective thermoregulation.
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Aim: To evaluate the efficacy of an automated retinal image grading system in diabetic retinopathy (DR) screening.

Materials And Methods: Color fundus images of patients of a DR screening project were analyzed for the purpose of the study. For each eye two set of images were acquired, one centerd on the disk and the other centerd on the macula.

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  • The study outlines a diabetic retinopathy (DR) screening program in Central Portugal, focusing on nonmydriatic procedures and the benefits of automated analysis.
  • Images from the screening are first evaluated by an automated system, then reviewed by humans using a grading scale that categorizes the severity of DR.
  • Since the automated analysis started, over 89,000 eyes were screened, showing high effectiveness in identifying DR while significantly reducing the workload for human graders by nearly 50%.
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Purpose: To evaluate the influence of a ranibizumab treatment on microaneurysm (MA) turnover in diabetic retinopathy.

Methods: Sixty-nine eyes were included in this retrospective study. We compared a group of 33 eyes with ranibizumab treatment for diabetic macular edema to 36 eyes with nonproliferative diabetic retinopathy only.

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Purpose. To evaluate the contribution of the ocular risk factors in the conversion of the fellow eye of patients with unilateral exudative AMD, using a novel semiautomated grading system. Materials and Methods.

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In 2010, vaccinia virus caused an outbreak of bovine vaccinia that affected dairy cattle and rural workers in Pará State, Brazil. Genetic analyses identified the virus as distinct from BeAn58058 vaccinia virus (identified in 1960s) and from smallpox vaccine virus strains. These findings suggest spread of autochthonous group 1 vaccinia virus in this region.

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Bovine anaplasmosis, caused by Anaplasma marginale, occurs in tropical and subtropical regions throughout the world and is a major constraint on cattle production in many countries. Approximately 60% of the buffalo herds in South America are located in northern Brazil. However, compared with the research on cattle, research on buffaloes has been neglected.

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Purpose: To evaluate the predictive value of microaneurysm (MA) formation rate concerning the development of clinically significant macular edema (CSME) in patients with mild-to-moderate nonproliferative diabetic retinopathy as evaluated by an automated analysis of central field fundus 30° photographs.

Methods: Two hundred and eighty-seven eyes were included in the study. Photographs obtained at Day 0, at 6, and 12 months were analyzed using the RetmarkerDR software (Critical Health SA) in a masked manner, and the MA formation rate was documented.

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Bovine babesiosis is a tick-borne disease caused mainly by Babesia bovis and Babesia bigemina, which are associated to considerable economic losses in cattle herds worldwide. Approximately 60% of buffalo herds in South America are located in Northern Brazil. Little is known about the impact of babesiosis on buffalo herds in Brazil.

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Invasive fungal infections (IFIs) are responsible for significant morbidity and mortality, especially in immunocompromised patients and in those requiring admission to an intensive care unit. The epidemiology of IFI is changing, and an increment in non-Aspergillus filamentous fungi and non-Candida albicans species has been observed. The present paper reviews the epidemiology and diagnosis of IFIs.

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Hereditary myotonia caused by mutations in CLCN1 has been previously described in humans, goats, dogs, mice and horses. The goal of this study was to characterize the clinical, morphological and genetic features of hereditary myotonia in Murrah buffalo. Clinical and laboratory evaluations were performed on affected and normal animals.

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This study aimed to investigate the frequency of homologous antibodies of IgG class against Borrelia burgdorferi in buffaloes in the state of Pará, Brazil. Blood serum samples from 491 buffaloes were analyzed by means of the indirect ELISA test, using crude antigen produced from a cultivar of the North American strain G39/40 of B. burgdorferi.

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Orf virus is the etiological agent of contagious ecthyma, a severe exanthematic disease that affects small ruminants. Orf virus is zoonosis that is associated with occupational contact with infected animals in human disease. Clinically, contagious ecthyma is characterized by the appearance of vesicles, pustules, ulcers, and papillomatous proliferative lesions on the skin of the lips and nostrils.

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Aim: To assess a two-step automated system (RetmarkerSR) that analyzes retinal photographs to detect diabetic retinopathy for the purpose of reducing the burden of manual grading.

Methods: Anonymous images from 5,386 patients screened in 2007 were obtained from a nonmydriatic diabetic retinopathy screening program in Portugal and graded by an experienced ophthalmologist. RetmarkerSR earmarked microaneurysms, generating two outputs: 'disease' or 'no disease'.

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  • * Out of 153 equine cases studied, 52 were affected with 19 fatalities, showing clinical signs mainly of colic and abdominal issues, typically developing within 12 hours to 4 days.
  • * Despite normal serum levels of key enzymes, there were elevated urea nitrogen and creatinine, alongside severe digestive system lesions, including hemorrhages and ulcerations; the precise toxins responsible for this condition remain unidentified.
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