Publications by authors named "Joao Fraga"

Background: Inflammatory bowel disease (IBD), represented by Crohn's disease (CD) and ulcerative colitis (UC), is a chronic condition that affects all age groups, predominantly in young individuals. Currently, an increase in the prevalence of IBD has been documented, in parallel with the increase in the elderly population. The scarce number of studies that better characterize the impact of IBD on Quality of Life (QoL) in the elderly motivated the present study.

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Considering the profound transformation affecting pathology practice, we aimed to develop a scalable artificial intelligence (AI) system to diagnose colorectal cancer from whole-slide images (WSI). For this, we propose a deep learning (DL) system that learns from weak labels, a sampling strategy that reduces the number of training samples by a factor of six without compromising performance, an approach to leverage a small subset of fully annotated samples, and a prototype with explainable predictions, active learning features and parallelisation. Noting some problems in the literature, this study is conducted with one of the largest WSI colorectal samples dataset with approximately 10,500 WSIs.

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Gal-3 plays an important role in cell survival, mRNA splicing, and cell-cell and cell-matrix interactions. Depending on its cellular localization and cancer type, Gal-3 may have tumour-suppressive or tumour-promoting activities. Given the promising diagnostic role of Gal-3 in the urine of PCa patients found in our previous study, its concordant gene and protein expression levels, and its involvement in PCa-related biological processes (e.

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Colorectal cancer (CRC) diagnosis is based on samples obtained from biopsies, assessed in pathology laboratories. Due to population growth and ageing, as well as better screening programs, the CRC incidence rate has been increasing, leading to a higher workload for pathologists. In this sense, the application of AI for automatic CRC diagnosis, particularly on whole-slide images (WSI), is of utmost relevance, in order to assist professionals in case triage and case review.

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Digital pathology (DP) is being deployed in many pathology laboratories, but most reported experiences refer to public health facilities. In this paper, we report our experience in DP transition at a high-volume private laboratory, addressing the main challenges in DP implementation in a private practice setting and how to overcome these issues. We started our implementation in 2020 and we are currently scanning 100% of our histology cases.

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Introduction And Aims: The central venous catheter (CVC) is an indispensable device in the daily practice of modern medicine. Thus, the implementation of CVC interferes with the care of a large number of patients. This project aimed to implement the best practices in the insertion of CVC in adult hospitals in Brazil.

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Most oncological cases can be detected by imaging techniques, but diagnosis is based on pathological assessment of tissue samples. In recent years, the pathology field has evolved to a digital era where tissue samples are digitised and evaluated on screen. As a result, digital pathology opened up many research opportunities, allowing the development of more advanced image processing techniques, as well as artificial intelligence (AI) methodologies.

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Ovarian cancer is the most fatal gynecologic malignancy. The incidence of ovarian cancer among female-to-male transsexuals receiving treatment with testosterone is unknown, and few cases have been reported in the literature. We report a recent case in our institution, a 23-year-old female-to-male transsexual patient who received testosterone supplementation.

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Introduction: Mesenchymal tumors of the liver are rare, and in this group, myxoid leiomyomas are even rarer. So far, only 2 cases have been reported in the literature.

Case Presentation: We aim to report the case of a 16-year-old female with a large lesion on the right hepatic lobe, grossly composed of gelatinous and heterogeneous tissue.

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Neuroendocrine carcinoma of the gallbladder is a very rare neoplasia comprising only 0.2% of all the gastrointestinal neuroendocrine tumors. We present the case of an 85-year-old male with nonspecific gastrointestinal symptoms, progressive weight loss, and deterioration in the preceding 15 days.

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Introduction: Drug-induced liver injury is an increasingly prevalent consequence of the diversification of available therapeutic weapons, mostly idiosyncratic and with several possible mechanisms and patterns of specific damage for each drug. Carvedilol, a widely used non-selective alpha and beta blocker leads, in very rare cases, to injury of the bile ducts by toxic metabolites, resulting in a mixed-pattern hepatitis with possible progression to chronic cholestatic syndrome and cirrhosis. The authors report the second known case of this important toxicity.

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Cellular angiofibroma is a mesenchymal tumor, described in 1997, without gender preference, that usually appears at age 40. The vulvovaginal area is the most common site in women, mimicking vulvar benign tumors, like Bartholin gland cyst. However, there are a few described cases of a deep or extra-pelvic angiofibroma.

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Introduction: Lynch syndrome (LS), the most common hereditary colorectal cancer syndrome, is characterized by mutations in mismatch repair (MMR) genes leading to an increased cancer risk, namely colorectal cancer.

Case: In the context of surveillance colonoscopy, a 40-mm flat lesion (0-IIa+b, Paris classification) was identified and submitted to piecemeal mucosal endoscopic resection in a 64-year-old LS patient with an MLH1 germline mutation (262delATC) and two previous segmental resections due to metachronous colorectal cancer. Pathology raised the suspicion of superficial submucosal invasive carcinoma with poor differentiation.

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This is a case report of a 45-year-old Caucasian man with chronic alcoholism. No history of liver disease or asbestos exposure. He complained of ascites during the last 3 years with worsening in the last year with severe ascites development.

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We report a case of a 36-year-old woman that presented with a painful mass in the outer quadrants of the left breast that had grown rapidly. Physical examination revealed a well circumscribed elastic mass and breast ultrasound showed a cyst measuring 26 mm with vegetation growing on the inner wall. Microscopic evaluation, after fine needle aspiration cytology (FNAC), suggested benign lesion.

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A 14-year-old boy undergoing treatment for nephrotic syndrome with steroids and cyclosporine presented with small sclerotic bone lesions in a routine chest radiograph. Similar lesions were found in other bones of the axial and appendicular skeleton. Despite the paucity of clinical symptoms and absence of laboratory data suggesting systemic mastocytosis, the diagnosis of an indolent form of this disorder was made based on radiographic signs and confirmed by biopsy.

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