Differentiation of equine paranasal sinus cysts and progressive ethmoid haematomas on computed tomographic images.
Authors: Berner D, Hellige M, Harvey G G, Gerlach K, Iglesias-Garcia M, Manso-Diaz G
Journal: Journal of equine veterinary science
Summary
# Editorial Summary Paranasal sinus cysts and progressive ethmoid haematomas present distinct surgical and prognostic challenges, yet distinguishing between them on computed tomography before intervention has remained difficult. Researchers from four European referral centres retrospectively reviewed CT images from 97 horses (24 with progressive ethmoid haematomas, 28 with paranasal sinus cysts, and 45 with sinusitis as controls), with multiple blinded observers assessing imaging characteristics to determine whether reliable differentiation was possible. Progressive ethmoid haematomas demonstrated significantly higher heterogeneity and attenuation values, whilst paranasal sinus cysts more consistently showed mineralisation within soft tissue, bone distortion (both internal and external), mineralised walls, and dental displacement. Inter-observer agreement was substantial to almost perfect across all three observers, indicating that specific imaging features can reliably distinguish between these two conditions prior to surgical planning. For practitioners, these CT findings—particularly the presence of mineralisation patterns and bone changes characteristic of cysts versus the heterogeneous appearance typical of haematomas—now provide evidence-based criteria to guide pre-operative diagnosis, allowing tailored surgical approaches and more accurate prognostic counselling for owners.
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Practical Takeaways
- •Pre-surgical CT evaluation can reliably differentiate paranasal sinus cysts from progressive ethmoid haematomas, enabling informed treatment planning and prognostic counselling before referral for surgery
- •Look for mineralisation, bone distortion, and mineralised walls on CT to suggest PSC; heterogeneous, higher-attenuation lesions suggest PEH
- •Consistent CT diagnostic criteria have been validated across multiple European referral centres, providing confidence in pre-operative diagnostic decision-making
Key Findings
- •Substantial to almost perfect inter-observer agreement was achieved between CT diagnosis and final diagnosis across all three observers for differentiating PSC and PEH
- •Heterogeneity and attenuation of lesions were significantly higher in PEH compared to PSC
- •Mineralisation, bone distortion, mineralised walls, and dental distortion were significantly more common in PSC than PEH
- •CT imaging characteristics reliably differentiated PEH from PSC with excellent diagnostic accuracy