Two Unusual Benign Tumours in Skulls from the Ossuary at Křtiny (Czech Republic)

Among 554 skulls of adult individuals from the ossuary at Křtiny, Moravia (late thirteenth to the mid‐eighteenth centuryAD), three (0.54 per cent) showed evidence of malignant tumours and two others (0.36 per cent) had changes suggestive of unusual benign tumours, which are described in the present article. The calvarium of a 20–25‐year‐old female has two osteoplastic overgrowths in the region of the left tuber parietale and in the left lateral part of the frontal bone. A macroscopic section showed a porotic structure with regularily arranged trabeculae. This was confirmed by radiographic examination, which detected two similar smaller shadows, and by histology and scanning electron microscopy, which showed the non‐lamellar, unevenly calcified structure of these curious multiple osteomatous formations (osteomas, hyperostosis). A calvarium of a 40–50‐year‐old male showed a horseshoe‐shaped excavation in the posterior part of the processi palatini of the maxilla, with destruction of the lower half of the nasal septum and the paramedial structures of the nasal cavity. These defects were well delimited macroscopically, radiographically and histologically, and seemed to be the result of pressure atrophy, perhaps from a slow growing benign tumour such as a fibroma or angiofibroma.