Approach to nodular dermatoses/ neoplasia Flashcards
What are the top 5 feline cutaneous tumours?
- Basal cell tumour
- Mast Cell Tumour
- Fibrosarcoma
- Squamous Cell Carcinoma
- Sebaceous adenoma
What is the RECIST criteria?
longest single dimensiom
What is the pincushion/ capillary technique?
- Negative pressure is not used
- Less distortion of the cell morphology
- Works best with tumours that exfoliate easily such as round cell tumours
How does aspiration with negative pressure work?
- Works better for dense tumoirs
- try negative pressure if pincushion technique does not work
What does it mean when the aspirate is non-diagnostic
- Missed the tumour
- Lack of cells tell you something
What is a tru-cut used for?
Use for soft tissue
What is an incisional biopsy?
Wedge incision- small section of mass removed with a scalpel blade or baker punch
When do you use an excisional biopsy?
- If treatments are not altered by histopathology results
- FNA diagnosis is strong
- Wont comprimise further treatment options
- Can be both diagnostic and therapeutic
What is an excisional biopsy?
Removal of the entire tumour with a surrounding barrier of normal tissue
What does a papilloma look like in young dogs?
Viral association
What does papilloma look like in older dogs?
Unknown cause
* Head, Feet, Eyelids, Genitals
What is a histiocytoma
- Common in dogs under three
- Solitary
- Regresses within 6 weeks
- Local conservative surgery
What is a mast cell tumour?
- Makes up to 21% of skin masses
- No sex predilection
- Increased risk with age
- Retriever, Boxer, Shar-Pei, Pug
- Dogs are significantly more likely to be obese
What is a soft tissue sarcoma?
- Spindle cell sarcoma
- Mesenchymoma
- Malignancy of mesenchymal origin
- Can arise anywhere
What is an SCC like in the dog?
Less common tha n the cat
Nail bed, planum, anus
Difficult to excise
Tumour stage is important
What is a basal cell tumour?
- Considered to be benign
- Most Common skin tumour in cats
- Often cystic and fluid filled
- Head, Neck and shoulder
- Excise with narrow margins
What are sebaceous nodules?
- Hyperplasia or warts
- Cured by conservative surgery
- Adenomas and carcinomas are rare
- Ulceration, inflammation, Invasion
What is a trichoepithelioma?
rare, benign, non-cancerous tumour that originates from hair follicles in the skin
* typically benign
* cured by conservative surgery
* malignancy and metastasis is very rare
What is a melanoma?
- Skin is typically <2cm in diameter
- 3 mitoses per 10hpf
- Muco-cutaneous, oral
- Malignant
What is an ear-canal tumour?
Older cats and dogs
Polyps, cysts, papillomas, adenomas
Ceruminous adenocarcinoma, SCC
Locally aggressive, metastasis <15%
Median Survival >2 years
Median survival 1 year in cats
