Multimodal Imaging to Identify and Characterize a P3 Cystic Lesion and Pathologic Fracture.

Summary

# Editorial Summary: Multimodal Imaging of P3 Cystic Lesions and Pathologic Fracture Whilst fractures, abscesses, and laminitis typically account for acute, non-weight-bearing lameness in the distal limb, less common pathologies—including cystic lesions and neoplastic conditions—warrant consideration in differential diagnoses. This 2020 case report by Ball and colleagues employed postmortem magnetic resonance imaging combined with gross and histopathological examination to fully characterise a large cystic lesion within the third phalanx (P3) that had progressed to pathologic fracture. The multimodal imaging approach provided detailed anatomical and tissue characterisation that would be difficult to achieve through radiography alone, demonstrating how advanced imaging modalities can improve diagnostic confidence in ambiguous lameness cases. For practitioners managing horses with unexplained distal limb lameness unresponsive to conventional treatment, this work underscores the clinical value of MRI in identifying space-occupying lesions and structural compromise before catastrophic fracture occurs. Understanding the imaging signatures and progression of cystic P3 lesions may facilitate earlier intervention and potentially improve outcomes, though further prospective studies would strengthen clinical decision-making protocols for similar presentations.

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Key Findings

• •A large cystic lesion in the third phalanx resulted in acute pathologic fracture in an equine patient
• •Postmortem MRI, gross pathology, and histopathology were used to fully characterize the lesion
• •Cystic lesions should be considered as differential diagnoses for acute non-weight-bearing lameness in the distal limb

Conditions Studied

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