Masticatory Muscle Myositis
Masticatory muscle myositis is caused by immune-mediated destruction of type 2 muscle fibers resulting in inflammation of the masticatory muscle.
Age of Onset: Any age of animal can be affected
Sex Predisposition: Any sex of animal can be affected
Clinical Course:
Clinical signs worsen over time
Clinical signs worsen over time
Clinical Signs:
Posture and Appearance
Bilateral enlarged masticatory muscles
Definition of bony landmarks of the skull
Unilateral or bilateral exophthalmos
Unilateral or bilateral protrusion of the third eyelid
Movement
Unable/reluctant to open mandible
Trismus
Muscle Atrophy
Atrophy and fibrosis of the muscle of the head
Pain Sensation
Facial myalgia
Other
Fever
Regional lymphadenopathy
Posture and Appearance
Bilateral enlarged masticatory muscles
Definition of bony landmarks of the skull
Unilateral or bilateral exophthalmos
Unilateral or bilateral protrusion of the third eyelid
Movement
Unable/reluctant to open mandible
Trismus
Muscle Atrophy
Atrophy and fibrosis of the muscle of the head
Pain Sensation
Facial myalgia
Other
Fever
Regional lymphadenopathy
Neuromuscular lesion of masticatory muscle
Unknown
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