PMC7218224_01
Abdominal USG showing a polypoid lesion inside the gallbladder; later on the lesion was confirmed to be an osteoma.
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PMC7218224_01_gr1.jpg
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An abdominal ultrasound revealed a thin walled gallbladder with a solitary 3 mm polyp (Fig. 1).
Histopathological study (H & E stain): A.- Panoramic view (4x) of polypoid lesion dependent on the mucosa of the gall bladder, at neck level. B.- Pedicle of the lesion in continuity with the lamina propria of the mucosa (10x). C and D.- Central portion of the lesion shows mature bone tissue of cortical appearance, with simple cylindrical, vesicular, discontinuous epithelial lining on the periphery of the polyp (40x).
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PMC7218224_01_gr2.jpg
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Features of this polyp were of mature lamellar type bone tissue, without the presence of bone marrow cells or osteoblasts in the periphery, covered by biliary type epithelium (Fig. 2).