Figure 2: Systemic lymphoma in 12-month-old rat (Marceau).
Case history and photos
History
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.
Treatment
High dosage of Baytril (10 mg bid PO).
Outcome
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.
Photos
 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. |
