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The biopsy showed mucosal ulceration with a proliferation of vascular channels associated with neutrophils and clumps of purplish, granular bacterial colonies, which were highlighted by a Warthin-Starry stain. The histopathological features were typical of bacillary angiomatosis. This case highlights bacillary angiomatosis involving the gastrointestinal tract at multiple sites, the cause of massive upper gastrointestinal hemorrhage that was the initial presentation of an HIV-positive patient, and the occurrence of visceral bacillary angiomatosis in the absence of cutaneous lesions<\/jats:p>","DOI":"10.1177\/106689690301100316","type":"journal-article","created":{"date-parts":[[2007,6,21]],"date-time":"2007-06-21T21:50:28Z","timestamp":1182462628000},"page":"241-244","source":"Crossref","is-referenced-by-count":14,"title":["Upper Gastrointestinal Bacillary Angiomatosis Causing Hematemesis: A Case Report"],"prefix":"10.1177","volume":"11","author":[{"given":"R.","family":"Chetty","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"R. 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