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Visible Tumors in Rodents

Rodent Tumors Visible to Owners
Kristin Claricoates, DVM
 
Mammary tumors:
Mammary gland neoplasia (cancer) is the most common neoplasm of mice and rats, but is rare in gerbils and hamsters.  Mammary tumors are typically large, firm, and usually only one tumor on the body.  It also feels detached from the rest of the body tissues and underlying body tissue. 
Most mammary tumors in rats and hamsters are benign, that is to say, these tumors do not spread to other tissues in the body.  In rats, 80% are benign tumors and 20% are malignant.  In mice and gerbils they are typically (~90% of the time) malignant, metastatic, invasive tumors, or very bad, progressive tumors.   They are also much more difficult to remove completely.  Mouse mammary tumors predispose the mouse to developing uterine adenocarcinoma. 
 
Skin tumors:
There are many types of skin tumors that can occur in rodents.  However, it is important to note that hamsters and gerbils have scent marking glands that are normal on the skin and are not tumors.  If you are concerned about seeing an unusual skin mass, please bring your animal in for us to examine and treat. 
Skin and subcutaneous tumors are uncommon in hamsters.  Melanoma is the type of skin tumor that may be seen in hamsters.
The skin and subcutaneous layer in gerbils is the second most common location for tumors in gerbils.  Adenomas and adenocarcinomas are the type of skin tumor most commonly seen in gerbils.
Skin neoplasms are uncommon in mice and rats.  In mice and rats, squamous cell carcinomas are most common. 
 
I think I see a growth on my pet.  Now what?
It is important for you to come to the veterinary hospital as soon as possible.  With some of these tumors, time is of the essence, and your pet has a much better prognosis (a forecast of the outcome of the disease) if it is handled sooner rather than waiting.
 
Treatment:
Treatment of any tumor is always to remove this tumor.  Depending on if it is malignant or benign, we may take more tissue or less tissue surrounding the tumor (the malignancy can be assessed but not diagnosed by a fine needle aspirate).  We recommend the removed mass be sent off to a laboratory and assessed to determine if it is benign or malignant.  If you choose, chemotherapy may be used to help treat patients with tumors depending on if the tumor type.
 
Prognosis:
The prognosis depends on the type of tumor. 
If the prognosis is guarded or poor, another alternative to surgery in these pets is medically managing any pain your pet may have and electing euthanasia when the mass becomes too large or spreads.
 
(Sources: Blackwell’s Five-Minute Veterinary Consult: Small Mammal, Second Edition. Barbara L. Oglesbee. © 2011 John Wiley & Sons, Inc. Published 2011 by
John Wiley & Sons, Inc
Ferrets, Rabbits, and Rodents: Clinical Medicine and Surgery, Third Edition.
Katherine E. Quesenberry and James W. Carpenter. © 2012 Saunders, an imprint of Elsevier Inc.)
 
​
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  • Home
  • Emergency Care
  • Care Sheets
    • General Care >
      • Dilated Cardiomyopathy (DCM)
      • Heating Reptile Enclosures
      • Health Veggie Shopping for Reptiles
      • Hypertrophic Cardiomyopathy
      • Metabolic Bone Disease Care
      • Vaccines in Exotic Animals
    • Birds >
      • Amazon Care
      • Avian Influenza Fact Sheet
      • Avian Influenza for Poultry Fact Sheet
      • Avian Bornavirus Testing
      • Budgie Care
      • Canaries
      • Chicken Care
      • Chronic Egg Laying
      • Cleaning and Disinfecting
      • Cockatiels (and other small Psittacines)
      • Cockatoo Care
      • ​Converting Your Bird to a Pelleted Diet
      • Feather Picking
      • General Parrot Care
      • Handfeeding Baby Parrots
      • Healthy Shopping for your Birds
      • Infectious Diseases of Parrots
      • Instructions for Physical Therapy in Birds
      • Lead Poisoning
      • McWatters Diet (Homemade Mash)
      • Macaw Care
      • Parrot Precautions
      • Polyoma Virus
      • Psittacine Beak and Feather Disease
      • Proventricular Dilatation Disease
      • Spiroform Pharangitis (Spirochetes)
      • Baby Starling and Sparrow guidelines
      • Can smoke affect my bird?
      • Territorial Aggression
      • Unsafe Plants for Birds
      • Weaning Baby Birds
      • What to Feed Your Pet Bird
      • Wing Injury and Rehabilitation
      • Wing Trims
      • Your Overly Reproductive Female Bird
      • Zinc Toxicity
    • Caiman Care
    • Ferret and Fox Care >
      • Your Ferret’s First Visit to the Vet
      • An Overview of Ferret Adrenal Disease
      • Chronic Diarrhea in Ferrets
      • Ferret Dentistry
      • Heart Disease in Ferrets
      • Heartworm Disease in Ferrets
      • Insulinoma in Ferrets
      • Lymphoma In Ferrets
      • Bob’s Chicken Gravy
      • Fennec Foxes
      • Red Foxes
    • Fish >
      • Algae in your Freshwater Aquarium
      • Eel Care
      • Freshwater Tropical Fish Care
      • Beginning a Freshwater Aquarium
      • Cleaning your Freshwater Aquarium
      • How to Feed your Fish
      • Aquarium Corals
      • Koi Care
      • General Goldfish Care
    • Invertebrate Care >
      • Blue Death Feigning Beetle Care
      • Giant Vinegaroon Care
      • Asian Forest Scorpion
      • Hairy Desert Scorpion
      • Hermit Crab Care
      • Tarantula Care - Basic
      • Millipede care
    • Frogs, Toads, and Other Amphibians >
      • Argentine Horned Frogs
      • Bullfrog Care
      • Dart Frog Care
      • Feeding Pet Frogs and Toads
      • Fire Bellied Toad Care
      • Pixie Frog Care
      • Red Eyed Tree Frog Care
      • Short Tongue Syndrome
      • Tiger Salamander Care
      • Axolotl Care
      • White Lipped Tree Frog Care
      • White's Tree Frog Care
      • Ranavirus
    • Guinea Pigs and Rodents >
      • Chinchilla Care
      • Cuy Criollo (Giant Guinea Pig)
      • Health Problems with Guinea Pigs
      • Degu Care
      • Gerbil Care
      • Guinea Pig Care
      • Hamster Care
      • Diabetic Hamster Diet
      • Mice Care
      • Rat Care
      • Health Problems with Rats
      • Prairie Dog Care
      • Odontoma
      • Veggies For Guinea Pigs
      • Visible Tumors in Rodents
      • Vitamin C Deficiency In Guinea Pigs
    • Hedgehog Care >
      • Baby Hedgehog (Hoglet) Care
    • Kinkajoos and Armadillos >
      • Kinkajou Care
      • Nine Banded Armadillo Care
    • Lizards >
      • Anole Care
      • Bearded Dragon Care
      • Blue Tongued Skink Care
      • Crested Gecko Care
      • Geckos of New Caledonia
      • Crocodile Monitor Care
      • Frilled Lizard Care
      • Green Iguana Care
      • Jackson's Chameleon Care
      • Leopard Gecko Care
      • Nile Monitor Care
      • Old World Chameleon Care
      • Panther Chameleon Care
      • Red-Eyed Crocodile Skink Care
      • Savannah Monitor Care
      • Tegu Care
      • Thai Water Dragon Care
      • Uromastyx Care
      • Veiled Chameleon Care
    • Potbellied Pigs >
      • Pot Belly Pigs
      • Diamond Skin Disease
    • Rabbits >
      • Bonding Rabbits Bullet Point Checklist
      • Healthy Shopping for Rabbits
      • Complete Rabbit Care
      • Getting To Know Your New Bunny
      • Training Your Bunny
      • What To Feed Your Rabbit
      • Learning to Use the Litter Box
      • What To Expect From Your New Rabbit
      • Dental Disease in Rabbits
      • Heart Disease in Rabbits
      • Healthy Stool in Rabbits
      • Gastrointestinal Stasis in Rabbits
      • RHDV2 Fact Sheet
      • Parasites of Rabbits
      • Sore Hocks in Rabbits
      • Pasteurella in Rabbits
      • Medicating Your Rabbit or Guinea Pig
    • Snakes >
      • Amazon Tree Boa Care
      • Ball Python Care
      • Black Rat Snake Care
      • Boa Constrictor Care
      • Brazilian Rainbow Boa Care
      • Burmese Python Care
      • California Kingsnake Care
      • Cornsnake Care
      • Dumeril's Boa Care
      • Eastern Kingsnake Care
      • Emerald Tree Boa Care
      • Garter Snake Care
      • Green Tree Python Care
      • Western Hognose Care
      • Mexican Black Kingsnake Care
      • Rosy Boa Care
      • Sand Boa Care
      • Western Fox Snake Care
      • Inclusion Body Disease
    • Sugar Gliders and Marsupials
    • Turtles and Tortoises >
      • Alligator Snapping Turtle Care
      • Bell's Hingeback Care
      • Box Turtle Care
      • Chinese Box Turtle Care
      • Common Snapping Turtle Care
      • General Tortoise Husbandry
      • Leopard Tortoise Care
      • Mud Turtle Care
      • Musk Turtle Care
      • Painted Turtle Care
      • Red Eared Slider Care
      • Russian Tortoise Care
      • Soft Shelled Turtle Care
      • Sulcata Care >
        • Diet For Sulcata Tortoises
      • Common Health Problems
      • General Care of Aquatic Turtles
      • Redfoot tortoise Care
  • Contact
    • Referrals
  • Vets, Externs & Shelters
    • Xoran CT
    • Acupuncture and Chiropratic Medicine
    • Erchonia Laser
    • Vet Day Camp >
      • Heart Supplement Formula
      • Avian Hemotology
    • Shelters
    • Externships
    • Jobs
  • Products
  • Links
  • About Us
  • Chicago Exotics Blog
    • About Us April Fools Page
  • Happy Turtle Stories
  • Tour
  • ADV Testing Information
  • Lacy Act Summary
  • Preparing for your pet's end of life