Flashcards in DL: FISS Deck (14)
What cellular origin does FISS have?
What are the predispositions to FISS?
No sex, breed, age predisposition
No vaccine/injection predisposition
Originally thought to be due to the adjuvant(s)
Now thought possibly to be any number of causes including just the stabbing action of the needle itself!
Where does Feline post-trauma intraocular sarcoma occur?
• Periocular and intraocular area
• common in cats who had experienced some form of trauma
Can FISS be cystic?
How do you diagnose FISS?
• PE and history – location, injection site
Why do an incisional rather than an excisional biopsy for tumours?
Incisonal (you take a section of it, do histopathology and then remove if necessary as the tumour won’t have been enhanced by this procedure) OR excisional (don’t choose this for tumours, risk that if you don’t remove all of the tumour, then you will have an area around the scar left from the biopsy to avoid PLUS another 3-5cm perimeter which makes the surgery bigger).
What do the Feline Task Force Guidelines suggest you do for a mass in a vaccination area?
o Biopsy if lump persists > 3 months
o Biopsy if >2cm (unlikely that a vaccine granuloma will be bigger than 2cm)
o Biopsy if it increases in size within one month post-vaccine
o ALWAYS INCISIONAL!
What is the major DDx for a FISS?
VACCINE GRANULOMA (i.e. an adverse reaction to the granuloma)
Disease Free Interval
Why is the outcome if the first surgery is performed by a referral surgeon?
A second surgery is less likely to be successful since the surgical site will be larger, the original anatomy will be altered, seeding through tissue planes (harder to assess on imaging and at surgery), likely that previously clean tissue will be contaminated, at time of first treatment there has been less time to metastasize, tumour upstaging.
What is the recommended treatment for FISS?
• Aggressive, multi-modality treatment recommended. Radical surgery necessary at start. Amputation if possible. Wide and deep surgical margins (3-5cm). Use radiation to shrink/debulk if not possible.
• Incompletely excised/narrow margins: adjuvant radiation therapy and chemotherapy should be performed. Surgery + radiation DFI 19m, 40% cure, Doxorubicin/carboplatin
The core feline vaccines
Feline Viral Rhinotracheitis, Calicivirus, Panleukopaenia, Chlamydiosis (Chlamydophila pssitaci)