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Srpski arhiv za celokupno lekarstvo 2019 Volume 147, Issue 3-4, Pages: 211-214
https://doi.org/10.2298/SARH180312037S
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Osseous metaplasia in an inflammatory polyp of the anal canal: A case report and a review of literature

Stevanović Dejan (School of Medicine, Clinical Hospital Center Zemun, Department of Surgery, Belgrade)
Aleksić Vuk (Clinical Hospital Center Zemun, Department of Neurosurgery, Belgrade)
Stojanović Dragoš (School of Medicine, Clinical Hospital Center Zemun, Department of Surgery, Belgrade)
Mitrović Nebojša (School of Medicine, Clinical Hospital Center Zemun, Department of Surgery, Belgrade)
Jašarović Damir (School of Medicine, Clinical Hospital Center Zemun, Department of Surgery, Belgrade)
Bokun-Vukašinović Zorana (Clinical Hospital Center Zemun, Department of Pathology, Belgrade)

Introduction. Osseous metaplasia is a heterotopic formation of bone and its appearance in benign gastrointestinal polyps is exceedingly rare. The mechanism responsible for this type of metaplasia is not fully understood, however it seems to be an innocent rare phenomenon. Case outline. We present a case of a 31-year-old male with mesenchimal osseal metaplasia in a large inflamatory polyp measuring 57 × 23 × 20 mm in diameter, located in the anal canal region. Conclusion. According to our knowledge, this is the largest gastrointestinal polyp with osseous metaplasia described so far. Although a rare phenomenon, there are certain characteristics of this disease, so we conducted a literature review and summarized these characteristics.

Keywords: osseous metaplasia, gastrointestinal polyps, inflammatory polyps