03 - mammary gland neoplasia

Question 1

dogs spayed before when have greatly reduced risk?

Answer 1

first estrus

Question 2

administration of progestins increase or decrease the risk?

Answer 2

increase

Question 3

(dx)

(signalment)

1. risk increases after what age?

Answer 3

1. 6 years

Question 4

(dx)

(px)

1. most occur in what mammary glands?
2. inflammatory tumors have diffuse swelling, which may look like mastitis
3. lymph nodes may be enlarged

Answer 4

1. caudal ones

Question 5

(dx imaging)

1. mammary tumors commonly mets to where?

Answer 5

1. lungs

Question 6

cytology

cytology isn’t great for tumor grading, but may help with what?

Answer 6

differentiating a tumor from mastitis

Question 7

histo

about what % are benign?

LN can also be sampled - if LN are involved prog is poor

Answer 7

50%

Question 8

(treatment)

1. tx of choice?

expect when?

2. what can be done if tumor is very small and non-invasive?
3. when multiple, nonadjacent glands are involved perform a what?
4. have used medical therapy with sx but efficacy has not been established

Answer 8

1. surgery

invasive mammary carcinoma (causes DIC, hard to remove all tissue)

2. lumpectomy
3. unilateral mastectomy

Question 9

(prog)

1. cats with tumors great than what size have a poorer prog?
2. in dogs, what is important?

Answer 9

1. 3 cm
2. histo grade and stage