Lymphoma Figure 2

Figure 2: Systemic lymphoma in 12-month-old rat (Marceau).
Case history and photos


Marceau, a 12-month-old hairless male rat weighing 16 ounces.

Clinical Signs

The owner noticed that the rat had a prominent swollen area on its neck. Later that day the owner noted that his testicles had become cyanotic and cool.

Initial Diagnosis

Possible septicemia or complications of lymphoma.


High dosage of Baytril (10 mg bid PO).


The cyanosis resolved, but the axillary and groin lymph nodes, were now visibly enlarged. Small hemorrhagic spots were appearing on his skin (focal erythema). The rats appetite decreased, his body temperature could not be maintained, and he was euthanized several days later.

Final Diagnosis

The cervical glands were sent to the lab and histopathology confirmed systemic lymphoma.


The above photos show enlarged cervical and axillary lymph glands.

Cyanosis (bluish/purplish discoloration due to lack of oxygen in the blood) of the testicles.

Focal erythema and petechiae.


Linked from


The Rat Guide and its affiliates accept no responsibility for misuse or misunderstanding of its information. This guide in whole or part, exists solely for the purpose of recognizing and understanding the care and illnesses in the pet rat. Please seek advice and treatment from a qualified Veterinarian if your rat is ill.

2000 - 2024 by Karen Grant RN. All rights reserved.
All other written and visual materials used by permission of specific authors for the sole use of the Rat Guide. Please visit our Privacy Policy for details.
Brought to you by KuddlyKorner4u
See Logos page for linking to the Rat Guide.
Contact us here: Rat Guide Team
Please note: Rat Guide email is not checked daily. Send e-mail to if you have an urgent medical problem with your pet rat. When possible, it is always best to take your rat to a qualified rat veterinarian.