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, Initially the face appears swollen, as the lesion progresses and heals by fibrosis, the head will take a more atrophied appearance with restricted movement of the mandible.
Clinical signs worsen over time, Initially the face appears swollen, as the lesion progresses and heals by fibrosis, the head will take a more atrophied appearance with restricted movement of the mandible.
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
Mandibular lymph node swelling
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
Mandibular lymph node swelling
Neuromuscular lesion of masticatory muscle
Unknown
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