Carroll County Animal Hospital

Henry's Lump

Henry, a four year old male castrated Boxer, presented to Carroll County Animal Hospital for a lump on his right rear leg.

Henry is up to date on vaccinations and is on monthly heartworm and flea protection. The lump was just noticed by his mom a few days ago and there is no evidence of pain from this area.
Henry is eating and drinking well. He is very playful and enjoys his daily walks.

Henry has a normal body temperature, respiration, and heart rate. His body condition score is 4/9, indicating an ideal body weight. Henry is not limping on the limb with the nodule. He does not act painful when the lump/nodule is examined. There are no skin infections noted in proximity to the nodule. The nodule of the right rear limb is mildly firm and freely movable. It is confined to the subcutaneous tissue and does not penetrate the musculature here.
No other abnormalities are found on Henry. His neurologic examination and lameness examination are normal.

A fine needle aspirate was taken from the area on Henry's hindlimb.

This procedure is done in hospital and allows examination of the cells found in the mass while looking through a microscope.

The following cells were found from the nodule.

These are cells found in a cutaneous mast cell tumor. Mast cell tumors arise from mast cells, cells found in the connective tissue of the body. This type of tumor is known as the "great pretender" because their appearance can vary from a reddened raise nodule to a wart-like growth. When a mass like this is found, the area should have a biopsy and further evaluation is recommended so that it can be graded. Mast Cells are graded on a scale according to how aggressive the cells behave.

Henry was scheduled for a biopsy surgery the following day. An excisional biopsy was performed. This is when the surgeon removes the entire involved growth. An incisional biopsy is when only a piece of the growth is removed.
The mass was sent to a laboratory and the results indicated that Henry has a low grade tumor (Grade 1).

This is great news for Henry because low grade cutaneous mast cell tumors have a good prognosis! Most Grade 1 tumors are curative with a wide biopsy excision. However, there is always a potential for reoccurence at another site of the body.
If a mass is found to be high grade then further surgery, radiation, and chemotherapy are recommended.

Henry is one of the few breeds that are most likely to have this type of tumor. Other breeds most affected are boston terriers but any breed is capable of this condition.

Henry is back to playing and enjoying life as a pampered boxer! Henry is a regular in our daily Doggie Daycare with his buddy Beau!

If you notice an unusual growth on your pet, please contact us immediately.