» Rat Guide     » Health Guide     » Care Guide     » Medication Guide     » Breeding Guide    

Endoparasites Figure 2

Figure 1: Tapeworm cyst (Taenia taeniaformis)- Resulting in death of 17-month-old male rat
Case history and photos

History

Hairless male, 17 months old.

Clinical Signs

This rat presented with a hard abdominal mass. Generally he did not seem to be in a great deal of discomfort, although his preference was to lie on a flat surface. He showed signs of discomfort when the lump was palpated by trying to squirm away. He did not vocalize as a sign of pain.
The day of his death he showed extreme pallor, weakness, lethargy, and loss of balance.

Diagnosis

Histopathology confirmed the diagnosis of a fibrosarcoma of the liver triggered by the tapeworm cyst. Death was from a massive internal hemorrhage where the tumor had damaged the hepatic tissue.

Necropsy

A necropsy showed a severe abdominal hemorrhage. The rat had a large mass attached to the liver. When bisected a feline tapeworm cyst (Taenia taeniaformis)was found inside of the mass.

Discussion

Typically, the tapeworm cyst is nothing more than an incidental finding during necropsy. However, there are occurrences of both fibrosarcomas and fibrohistiosarcomas being induced by the presence of taenia taeniaformis cysts (which have been shown to possess a carcinogenic agent). These cancers tend to be locally aggressive and can metastasize.

Photos

Tape worm cyst liver mass
The above photo is of the bisected mass. The arrow points to the cystic area inside of the mass where the tapeworm was located.

Tape worm cyst liver mass
The tapeworm after it’s removal from the mass.

Case history by J. Bella Hodges
Necropsy and photos by M.Zieten
Histopathology by IDEXX RADIL

Posted on January 17, 2011, 15:40, Last updated on January 17, 2011, 22:16 | Figures



Rat Guide Logo
All other written and visual materials used by permission of specific authors for the sole use of the Rat Guide.
Brought to you by KuddlyKorner4u
See Logos page for linking to the Rat Guide.
Rat Guide brought to you by KuddlyKorner4u