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732 Ovarian Remnant Syndrome

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OTODECTIC MANGE Gross appearance of a young cat with otodectic mange.
The pinna appears normal, but copious specks of characteristic exudate (“coffee OTODECTIC MANGE Microscopic appearance of ear mites (Otodectes cynotis).
grounds”) are visible in the ear canal. (Copyright Dr. Manon Paradis, University (Copyright Dr. Manon Paradis, University of Montreal.)
of Montreal.)

Isoxazolines: PROGNOSIS & OUTCOME Technician Tips
• Dogs Diagnosis may be falsely based on typical
○ Fluralaner (Bravecto 25 mg/kg PO) as a Excellent appearance of otic exudate alone, without
single oral dose visualization of parasites on microscopy. This
○ Sarolaner (Simparica 2 mg/kg PO) as a PEARLS & CONSIDERATIONS is often misleading.
single oral dose or 2 treatments 30 days
apart Comments Client Education
• Cats • Other household pets such as ferrets can Many pet owners seeing inflamed ears with
○ Fluralaner (Bravecto spot-on solution, become infested. discharge assume it is an ear mite infestation,
40 mg/kg) applied topically once • Ear mites can be eradicated only if all animals often leading to weeks of inappropriate treat-
○ A combination of selamectin plus sarolaner in contact are treated simultaneously, even ment with over-the-counter treatments.
spot-on formulation (Revolution Plus, if signs of disease are absent.
Stronghold Plus) applied topically once SUGGESTED READING
Prevention
Drug Interactions • Ear mites have a 3-week life cycle and a Taenzler J, et al: Efficacy of fluralaner against Otodectes
cynotis infestations in dogs and cats. Parasit Vectors
Off-label doses of ivermectin or moxidectin 2-month life span. They can live off the 10(1):30, 2017.
should not be used in sensitive canine breeds host for weeks. Environment may require AUTHOR: Vincent E. Defalque, DVM, DACVD
unless the MDR1/ABCB1-Δ gene mutation is thorough cleaning and treatment in cattery EDITOR: Manon Paradis, DMV, MVSc, DACVD
confirmed to be absent (p. 638). or kennel situations.
• When Revolution/Stronghold or Advantage
Possible Complications Multi/Advocate is used as flea control, it
Otitis media has the added benefit of ongoing ear mite
prevention.
Recommended Monitoring
Repeat ear swab and physical exam 1 month
after first treatment if clinical signs persist.

Ovarian Remnant Syndrome

Epidemiology GENETICS, BREED PREDISPOSITION
BASIC INFORMATION
SPECIES, AGE, SEX Large-breed dogs may have increased incidence.
Definition Female dog or cat; months to years after
Presence of functional ovarian tissue in a previ- ovariectomy (OVE) or ovariohysterectomy RISK FACTORS
ously ovariectomized bitch or queen (OHE) OVE during estrus or at time of cesarean section
may increase risk.

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