Nodules & Draining Tracts Flashcards
Defintion of Nodule
deep pyodermas
What is the most common bacteria causing deep pyodermas in dogs?
Staphylococcus pseudointermedius
deep pyodermas
What is bacterial furunculosis?
A type of deep pyoderma
draining tract that forms as a result of deeply inflammed hair follicles (deep folliculitis) => may coalesce to form deep ulcers
is a common complication of SF folliculitis
deep pyodermas
Two factors that differentiate a superficial foliculitis from a furniculosis?
Furniculosis = Painful & bleeds easily
deep pyodermas
A dog presents for recurrent deep pyodermas. What condition is a top differential for its origin?
Demodicosis
Recurrent pyoderma almost always 2º to underlying condition
Others: contaminated shampoos
deep pyodermas
What is Acral Lick Dermatitis? // granuloma
A type of deep pyoderma
Etiology: lesion caused by compulsive licking of lower portion of limb due to an underlying disease
Underlying diseases reported:
- hypersensitivity disorders, joint disease/pain, neuropathy, deep bacterial or fungal infection, obsessive compulsive disorder
deep pyodermas
What are the lesions of mild/early vs. chronic vs. severe forms of acral lick dermatitis?
Mild/early: alopecia, hyperkeratosis
Chronic: alopecia & nodule (image)
Severe: alopecia, ulcers, draining tracts
deep pyodermas
What is a callus pyoderma?
“pressure point pyoderma”
Chronic friction/pressure on the hair follicles => obstruction and subsequent rupture of hair follicles
Large and giant breeds
Chronic: alopecia + draining tract
Tx of deep pyodermas?
Systemic ABX (topical alone not enough!) for 2 weeks beyond clinical resolution
culture + sensitivity may be needed for recurrent cases
non-infectious
Signalment, etiology and presentation of juvenile cellulitis
Puppy strangles
Signalment
- puppies (3 weeks to 4 months old)
- no breed predisposition
History/etiology
- acute onset; +/- recent vaccination
Presentation
- swollen muzzle, eyelids, lips; draining tracts, pus, crust
tx = glucocorticoids
non-infectious
Signalment, etiology and pathogenesis/tx of Interdigital comedone and cyst?
Canine interdigital palmar and plantar comdedones & follicular cyst
Signlament
- large and giant-breed dogs
- dogs with bowed elbows & hocks (bulldogs)
Cause
- chronic external surface trauma/friction to the interdigital hair skin => plugging of hair follicles // hyperkeratosis
- an anatomical problem -> surgery will only cure the present lesion formation; will NOT prevent future lesion formation at adjacent skin
What are the top 3 ddx for cause draining tracts in interdigital areas?
ddx against Interdigital comedone and cyst?
- Atopic dermatitis
- Pedal demodicosis
- Deep bacterial and fungal infection
non-infectious
Signalment, etiology and pathogenesis/tx of canine perianal fistula?
Immune-mediated dermatosis
Signalment
- German shepherds
Pathogenesis
- unknown; skin lesions confied to the perianal regions
- presents PAINFUL!
TX
- Medical management, life-long (cyclosporine, topical tacrolimus; abx
- Sx: anal sacculectomy (if draining tracts communicate w/ anal glands)
neoplastic
What is a lipoma?
Benign neoplasia that forms from SC fat cells (adipocytes)
- DOGS > cats
- well demarcated
- truncal regions; limbs
neoplastic
What is a histocytoma?
Benign neoplasia arising from histocytes (APCs) on head, pinnae, limbs
- DOGS > cats
neoplastic
What is a sebaceous adenoma?
Benign neoplasia arising from sebaceous gland cells (sebocytes)
- DOGS > cats; older dogs
- eyelids, limbs, truncal regions
sebaceous adenomacarcinoma = aggressive infilatrative tumor but rarely metastasizes
neoplastic
Where do MCTs distribute and what do they look like?
can distribute anywhere and look like anything
