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Multicentric Benign Epithelial Inclusions in a Free-ranging Risso's Dolphin (Grampus griseus).

J Diaz-Delgado1, O Quesada-Canales2, M Arbelo2

  • 1Veterinary Histology and Pathology, Institute for Animal Health, Veterinary College, University of Las Palmas de Gran Canaria, Trasmontaña s/n, Arucas, Gran Canaria, Spain; Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, USA.

Journal of Comparative Pathology
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Summary
This summary is machine-generated.

This study details benign epithelial inclusions in a Risso's dolphin, identifying them as reactive mesothelium. This rare finding offers new insights into marine mammal pathology.

Keywords:
Risso's dolphinepithelial inclusionsreactive mesothelium

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Area of Science:

  • Veterinary Pathology
  • Marine Mammal Medicine
  • Comparative Oncology

Background:

  • Benign epithelial inclusions (BEIs) are rare, with limited documentation in marine mammals.
  • Understanding BEIs aids in differentiating neoplastic from reactive conditions in cetaceans.

Observation:

  • Histological and immunohistochemical analysis of multicentric BEIs in an adult female Risso's dolphin (Grampus griseus).
  • Differential diagnoses considered included ectopic hamartomatous epithelial inclusions, choristomas, and low-grade metastatic neoplasms.
  • Focal pleural rupture and specific immunophenotypical features were noted.

Findings:

  • The BEIs were diagnosed as multicentric, embolic, reactive mesothelium.
  • This diagnosis was supported by cytomorphological and immunophenotypical characteristics.
  • This condition is novel in marine mammals and rare in other species.

Implications:

  • This finding expands the known pathological conditions in marine mammals.
  • Highlights the importance of considering reactive mesothelial processes in cetacean diagnostics.
  • Contributes to the comparative understanding of epithelial inclusion pathologies across species.