[MARMAM] Abnormal swelling in Stenella frontalis: summary of responses
Fabian Ritter, MEER e.V.
ritter at m-e-e-r.de
Fri Nov 13 06:14:15 PST 2009
Thanks to everybody who responded to our previous posting concerning the
abnormal swelling observed in a young spotted dolphin off La Gomera
(Canary Islands). We have received a multitude of comments as well as a
variety of ideas and diagnoses, including a conclusive one. Several
similar observations were described, involving both spotted dolphin
calves in the Azores and the Canaries as well as a juvenile/young adult
male grey seal. We have placed some additional images from our
colleagues on our website at:
Potential reasons for the abnormal swelling in the spotted dolphin calf
included the following:
- congenital umbilical hernia
- contaminants responsible for dysfunction of the endocrine system
- congested mammary glands
- a "good slam" causing internal swelling and hemorrhage
- rudimentary hind limbs
- some type of tumour
- parasitic/bacterial infection (crassicauda, brucella, etc.)
Moreover, a small animal veterinarian explained that in young cats there
is a disease called fibroadenomatous hyperplasia that makes the mammary
glands swell quite significantly.
Finally, our colleagues from the University of Las Palmas/Gran Canaria
(ULPGC) resolved the puzzle by describing a similar case they had a few
years ago: A stranded spotted dolphin calf was necropsied and the ULPGC
pathologists found the reason to be a bacterial abscess, most probably
caused by a (secondary) infection of a /Phyllobotrium delfini/ cyst.
This infection could have been caused by an open wound, and the abscess
apparently had grown exuberantly so as to cause an obstruction of the
ureter, which in turn lead to the death and the stranding of the animal.
An image of this animal can be seen following the link above.
Thank you all again, I hope this will be of interest to other
researchers coming across something similar in the future.
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