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Unbiased stereologic estimation of the spatial distribution of Paget's disease in the human temporal bone
Sune Land Bloch1, Mads Sølvsten Sørensen
1*Department of Otolaryngology, Head and Neck Surgery, Køge Hospital, University of Copenhagen, Denmark; and †Department of Otolaryngology, Head and Neck Surgery, Rigshospitalet, University Hospital of Copenhagen, Denmark.
Background:
It has been suggested that Paget's disease of bone and otosclerosis may share a myxoviral etiology. However, the association between virus infection and pathologic bone remodeling is still controversial. The aim of this study was to estimate the spatial distribution of pagetic bone remodeling around the inner ear space and to compare it with that of otosclerosis in a contemporary context of temporal bone dynamics.
Materials And Methods:
From the temporal bone collection of Massachusetts Eye and Ear Infirmary, 15 of 29 temporal bones with Paget's disease were selected to obtain an independent sample. All volume distributions were obtained along the normal axis of capsular bone remodeling activity by the use of vector-based stereology.
Results:
Pagetic bone remodeling was distributed centrifugally around the inner ear space at the individual and the general level. This pattern is similar to the normal distribution of perilabyrinthine bone remodeling but entirely different from the spatial location of otosclerosis, which are focal and centripetally distributed around the inner ear space.
Conclusion:
In Paget's disease, the antiresorptive barrier around the inner ear space becomes gradually overruled as pagetic bone resorption invades the otic capsule from the outside. However, in otosclerosis, this barrier has somehow failed locally inside the otic capsule. Although virus infections potentially may trigger osteoclastic activity additional pathogenetic factors are needed to explain the organ-specific nature and spatial properties of otosclerosis.
Insights
Paget's disease shows bone remodeling spreading outward from the inner ear, unlike otosclerosis, which affects the inner ear focally. This difference suggests distinct pathological mechanisms despite potential viral triggers.
Area of Science:
- Otolaryngology
- Pathology
- Bone Biology
Background:
- Investigating a potential shared viral etiology between Paget's disease of bone and otosclerosis.
- Examining the controversial link between viral infections and pathological bone remodeling.
Purpose of the Study:
- To map the spatial distribution of Paget's disease bone remodeling around the inner ear.
- To compare this distribution with that of otosclerosis in temporal bones.
Main Methods:
- Analysis of 15 temporal bones with Paget's disease from a specialized collection.
- Utilizing vector-based stereology to determine volume distributions of bone remodeling.
Main Results:
- Pagetic bone remodeling exhibited a centrifugal pattern around the inner ear.
- This pattern contrasts with otosclerosis, characterized by focal, centripetal remodeling within the inner ear space.
Conclusions:
- Paget's disease involves external bone resorption invading the otic capsule, while otosclerosis shows localized internal failure.
- While viruses may initiate osteoclast activity, other factors are crucial for otosclerosis's specific characteristics.
