CT Flashcards
Dermoid Cyst
Other DDX: Meningocele
- Failure for the neuro and ectoderm to separate
- Tract along the midline of the nasal planum
- Sometimes creates an abscess in the calvarium
Ossifying nasal polyp
- Carcinoma
- extra-skeletal osteosarc
- MLO
- osteochondroma
- Harmatoma
Young cat
Polyp.
- Rim enhancing
Destructive rhinitis - Fungal
- Thickening of the mucosa
- Thickening of the overlying bone (hyperostosis)
- Lysis and cavitations
Fungal - Apergillus
Hyperosteosis
Cavitations
Lysis
Cryptococcous
Impacted tooth with aspergillus
See the nasal turbinate destruction and cavitations as well.
Most common neoplasm for dogs and cats in the nose?
- Cat
- Lymphoma
- Epithelieum - Carcinoma
- Dogs
- Epithelieum - carcinoma
- Mesenchymal - osteosarc, chondro
Harmatoma
- Osteosarcoma, osteochondroma, MLO, ossifying polpy, ex.
Post trauma
Hematoma secondary to trauma
MLO arises from?
TMJ and zygomatic bones
Lymphoma
Soft palate thickening. Lymphoma is the most common soft palate neoplasia in cats and dogs.
Dentigerous cysts
Associated with unerrupted teeth enamel (tops) usually in brachycepalic dogs (first premolar)
Radicular cyst comes from the tooth root.
OCD of the TMJ
Juviniel Mascitory muscle myositis.
Common in Cavies
What disease in cats can cause endoopthalamistis
FIP
Bilateral extraocular myositis
- Swelling of the extraocular muscles
- Common in goldens
Zygomatic sialoadenitis or abscess
Old cat
Feline restrictive orbital myofibroblastic sarcoma (FROMS)
- Middle age to old adult
- Can cause orbital lysis
- Loss of retrobulbar fat layers with diffuse soft tissue proliferation.
- Scleral and episcleral thickening of the eyeb
Sialoliths
Dacryops
- Cyst of the nasolacrimal duct.
Chronic dacryocystitis
- Bony proliferation
- Lysis
arural cholestrosteatoma - bilateral
- Commonly bilateral
- They are epidermoid cysts actually.
- Expansile with mixed echogenic/lytic
SCC of the ear
- This is just an aggressive osseous lesion of the ear and SCC is the most common in cats (ceruminous gland adenocarcinoma)
Occipital dyplasia (keyhole malformation)
- The dotted line represents where the occipital bone should go.
Open fontenelles with mild meningocele and hydrocephalus
Chronic fracture with sequestrum and chronic osteomyelitis.
Sequestrum
Cloaca
INVOLUCRUM - Periosteal new bone making a volcano.
Young westie
CMO
- No lysis
- Labs, dobies and bullmastifis can get it
Bullmastif
Calvarial hyperostosis
- Can have eosinophilia
- Can have lymphadenopathy.
MLO
- Commonly invades
- BC is surgerically put there after previous removal
- Zygomatic arch and calvarium
Osteomas are usually slow growing smoothly marginate that don’t cause lysis and can be in the sinus
Nasopharyngeal stenosis
Most common pharyngeal neoplasia in the dog? Cat?
Dog
- Melanoma
- SCC
- Fibrosarc
Cat
- Lymphoma
Most common laryngeal neoplasia in the dog? Cat?
Dog
- Carcinoma
- Rhabdo
Cat
- Lymphoma
- SCC
Young cat
Nasopolyp
Wooden foreign body
- Often located in the facial planes in an area from C1 to C4
- Well defined
Laryngeal mass: SCC vs lymphoma