Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/73840
Title: Mucoperiosteal Exostoses in the Tympanic Bulla of African Lions (Panthera leo)
Authors: Novales, M.
Ginel, P. J.
Diz, A.
Blanco, B.
Zafra Leva,Rafael 
Guerra, R.
Mozos, E.
UNESCO Clasification: 310907 Patología
Keywords: Middle-Ear Disease
Dog
Cat
African Lion
Computed Tomography, et al
Issue Date: 2015
Journal: Veterinary Pathology 
Abstract: Mucoperiosteal exostoses (MpEs) of the tympanic bulla (TB), also referred as middle-ear otoliths, have been occasionally described in dogs and cats in association with clinical signs of otitis media or as an incidental finding, but they have not been recorded in other species. In this report, we describe the radiographic, gross, and histopathologic features of MpEs in 8 African lions (Panthera leo). All animals (5 males and 3 females) were adults that had been kept in captivity and had their skeletons conserved as part of an anatomic academic collection. A radiographic study revealed mineralized structures in the TB consistent with MpEs in 7 of the 16 examined TB; a computed tomography study identified MpEs in 12 of the 16 TB. Six TB from 4 lions were sectioned, and several MpEs were demineralized for histopathologic analysis. Grossly, MpEs appeared variable in number and shape. Some were globular structures that were loosely attached to the mucosal surface of the TB; others were isolated to coalescent bone spicules extending from the mucoperiosteum. Position was also variable, but MpEs frequently developed in the hypotympanum, especially on the ventromedial aspect of the TB wall. Microscopically, MpEs were composed of osteonal bone growing from the periosteum and not by dystrophic calcification of necrotic tissue debris, as is hypothesized in dogs.
URI: http://hdl.handle.net/10553/73840
ISSN: 0300-9858
DOI: 10.1177/0300985814531499
Source: Veterinary Pathology [ISSN 0300-9858], v. 52 (2), p. 377-383, (Marzo 2015)
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