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Updated: Sep 3, 2025

Image Rendering Techniques in Postmortem Computed Tomography: Evaluation of Biological Health and Profile in Stranded Cetaceans

Published on: September 27, 2020

Budd-Chiari-like pathology in dolphins.

Antonio Fernandez¹, Paul D Jepson^2,3, Josue Diaz-Delgado²

¹Veterinary Histology and Pathology, Institute of Animal Health, University of Las Palmas de Gran Canaria, Veterinary School, C/ Transmontaña s/n, Arucas, 35416, Las Palmas, Spain. antonio.fernandez@ulpgc.es.

Scientific Reports

|July 25, 2022

Summary

This summary is machine-generated.

Cystic liver lesions (CLL) in dolphins may stem from hepatic vascular issues exacerbated by gas bubbles, differing from sonar-induced beaked whale injuries. Further research is needed for precise causes.

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Area of Science:

Veterinary Pathology
Marine Mammal Medicine
Cetacean Health

Background:

Pathologic findings suggested mid-frequency active naval military sonar (MFAS) caused gas embolism and "gas-bubble" lesions in stranded cetaceans.
Enigmatic cystic liver lesions (CLL) were previously observed in various cetaceans and tentatively linked to gas bubbles.

Purpose of the Study:

To re-evaluate the pathology of cystic liver lesions (CLL) in odontocetes (toothed whales).
To differentiate CLL from acute systemic gas embolism observed in beaked whales potentially linked to MFAS.

Main Methods:

Necropsy of 1,200 cetaceans.
Pathologic examination of striped dolphins (Stenella coeruleoalba) exhibiting CLL.
Comparative analysis of CLL and gas embolism in beaked whales.

Main Results:

Cystic liver lesions (CLL) were found in only 2% (4 out of 179) of examined striped dolphins.
Data suggest CLL result from a combination of pre-existing hepatic vascular disorders and exacerbated gas bubbles.
CLL pathology differs significantly from acute systemic gas embolism linked to MFAS in beaked whales.

Conclusions:

Cystic liver lesions (CLL) in dolphins are distinct from MFAS-related gas embolism in beaked whales.
A Budd-Chiari-like syndrome is hypothesized for dolphins with CLL.
Further research is necessary to determine the exact etiopathogenesis of CLL in cetaceans.