Macro image

Photo 1: Serosal surface of forestomachs and abomasum: The forestomachs have a ribbed appearance because of severe diffuse thickening of the epithelium (hyperplasia) and massive thickening of the keratinised layer (orthokeratotic hyperkeratosis)

Photo 2: Severe, diffuse, light brown, rough thickening of the epithelium (hyperplasia) of the rumen and reticulum with moderate thickening of the keratinised layer (orthokeratotic hyperkeratosis)

Hyperkeratosis Rumen / Macro Hyperkeratosis Rumen 2 / Macro
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Histological image

Severe diffuse thickening of the keratinised layer with normal keratin layers (orthokeratotic hyperkeratosis) and partly with keratin layers with visible nuclei (parakeratotic hyperkeratosis); mild diffuse hypertrophy and hyperplasia of the epithelium caused by proliferation of the stratum spinosum (acanthosis); mild exocytosis of a few neutrophils and macrophages in the stratum basale.

Hyperkeratosis Rumen / Histo
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Macroscopic diagnosis

Severe diffuse hyperkeratosis of the rumen and reticulum

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Histologic diagnosis

Severe, chronic, diffuse, orthokeratotic and parakeratotic hyperkeratosis of the rumen with mild acanthosis and mild suppurative rumenitis

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