Aortic Aneurysm in Bonobos and Cranes

Summary Information

Diseases / List of Miscellaneous / Metabolic / Multifactorial Diseases / Disease summary
Alternative Names
  • Aortic dissection
  • Aortic aneurism
Disease Agents
  • "An aneurysm is a localized dilatation or outpouching of a thinned and weakened portion of a vessel." This usually affect arteries, but sometimes veins. Most cases are of idiopathic origin. (B666.7.w7)
  • "Aneurisms are local enlargements of the arterial lumen and may be classified as true (when the wall of the aneurysm is formed initially by the stretched wall) or false (when the vessel wall is ruptured, allowing blood to escape into the surrounding tissues in often large amounts and to be enclosed by them to form a false sac). (B664.9.w9)
    • "In true aneurysms, the causative pathological process weakens the vessel wall so that the systolic blood pressure leads to stretching and dilatation of the wall, with compression of the surrounding tissue and often its ultimate rupture." (B664.9.w9)
  • Dissecting aneurysms occur due to Erdheim's degradation of the tunica media of the aorta. (B664.9.w9)
  • Possibly associated with hypertension. (B665.53.w53)
Infectious Agent(s) --
Non-infectious Agent(s)  
Physical Agent(s) --
General Description
Clinical signs
In Bonobos
In Cranes
Gross pathology
In Bonobos
  • Cardiovascular:  (B664.9.w9)
    • Cardiomegaly (heart weight 330 g). A dissecting aneurysm in the ascending part of the aortic arch.
    • In the aorta, other great vessels and cerebral arteries, atheromatous plaques.
  • Renal: (B664.9.w9)
    • "linear renal scars of vascular origin". (B664.9.w9)
In Cranes
  • Cardiovascular: an aortic aneurism was present. (P87.1.w2)
Further Information
In Bonobos
  • Aortic aneurysm occurs in Pan paniscus - Bonobo, but is less common than in Gorilla gorilla - Gorilla. (J504.31S.w1)
  • Aortic aneurysm has been reported causing sudden death in a 21-year-old male Pan paniscus at San Diego Zoo. (B664.9.w9)
  • Aortic dissection has been reported as the cause of death in a 14-year-old captive born male bonobo. (P131.w2)
  • Three cases of aortic dissection have been seen in bonobos since 1994 (when a paper came out describing eight cases in gorillas). (B665.53.w53)
In Great Apes
  • In a Pan paniscus - Bonobo thoracic radiography while the bonobo was alive revealed an enlarged heart, which was confirmed at necropsy (weight 330 g). (B664.9.w9)
In Cranes
Associated Techniques
Host taxa groups /species Mammals


Author Dr Debra Bourne MA VetMB PhD MRCVS (V.w5)

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