Whats your diagnosis #5

Whats your diagnosis #5

History: An 18 week old female pig was found down and on her side and not able to get up.   It is unknown whether other individuals are affected.

Gross Findings:

The muscles of the right shoulder and neck including the subscapularis, infraspinatus, and the supraspinatus muscles had multifocal white streaks running parallel to the direction of the muscle fibers.  The bilateral epaxial musculature including the longissimus dorsi contained similar white streaking.

The stomach had a 6 cm x 2 cm ulceration of the glandular mucosa.

Pig, Longissimus dorsi muscle: Multifocal white streaks

Pig shoulder: Multifocal pale streaks

Pig Shoulder: Multifocal muscle streaking

Differential Diagnoses based on the gross findings:

1. Myonecrosis:

a. Porcine stress syndrome (Malignant hyperthermia)

b. Exertional Rhabdomyolysis

c. Vitamin E/ Se deficiency

d. Ionophore toxicity

e. Gossypol, Coyotillo, Coffee Senna Plant ingestion

2. Myositis:

a. Trichinella spiralis

b. Arcanobacterium pyogenes

c. Clostridial myositis

The pattern and location of the gross lesions could help narrow the list of differentials….

And histopathology will be able to rule out most of the above diseases…

To be continued….

About Brian

Anatomic Pathologist, VetPath Services, Stone Ridge, NY- musculoskeletal, oral/dental, and sinonasal diseases www.vetpathservices.com
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