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− | <big><center>[[Skin - congenital#Porcine Juvenile Pustular Psoriasiform Dermatitis|'''BACK TO SKIN - CONGENITAL''']]</center></big>
| + | *Also called '''Pityriasis Rosea''' |
| + | *Occurs in pigs |
| + | *Symmetric lesions on the abdomen, loin and medial thigh |
| + | *Start as small [[Skin Glossary - Pathology|papules]] covered by brown [[Skin Glossary - Pathology|crusts]] |
| + | *-> lesions join and spread -> umbilicated [[Skin Glossary - Pathology|plaques]] containing white centres with erythematous and scaly borders |
| + | *Similar to [[Dermatophytosis|dermatophytosis]] |
| + | *Histologically: |
| + | **Epidermal hyperplasia, [[Skin Glossary - Pathology|parakeratosis]], epidermal [[Skin Glossary - Pathology|pustules]] and superficial perivascular dermatitis |
| + | *For more detail see [[Porcine Juvenile Pustular Psoriasiform Dermatitis]] |
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| ==Porcine Juvenile Pustular Psoriasiform Dermatitis (Pityriasis rosea)== | | ==Porcine Juvenile Pustular Psoriasiform Dermatitis (Pityriasis rosea)== |
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| ===General=== | | ===General=== |
| *Pityriasis rosea is a self‑limiting inflammatory disease of young pigs. | | *Pityriasis rosea is a self‑limiting inflammatory disease of young pigs. |
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| *The condition most frequently occurs in young pigs, 3‑14 weeks of age, and often more than one member of a litter is affected. | | *The condition most frequently occurs in young pigs, 3‑14 weeks of age, and often more than one member of a litter is affected. |
| *'''Although this condition had been previously called pityriasis rosea, clinically and pathologically it is nothing like pityriasis rosea in humans!''' | | *'''Although this condition had been previously called pityriasis rosea, clinically and pathologically it is nothing like pityriasis rosea in humans!''' |
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| ===Clinical Signs=== | | ===Clinical Signs=== |
| *There are usually no systemic signs. Skin lesions may be preceded by anorexia, vomiting, & diarrhea. | | *There are usually no systemic signs. Skin lesions may be preceded by anorexia, vomiting, & diarrhea. |
| *There is no fever. | | *There is no fever. |
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| ===Gross Lesions=== | | ===Gross Lesions=== |
| *Primary lesions are seen on the ventral abdomen or medial thighs, and appear as symmetric, sharply defined, red raised plaques up to 6 mm in diameter. | | *Primary lesions are seen on the ventral abdomen or medial thighs, and appear as symmetric, sharply defined, red raised plaques up to 6 mm in diameter. |
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| **The term pseudo-ringworm has been used to describe this condition. | | **The term pseudo-ringworm has been used to describe this condition. |
| *Lesions are nonirritant and usually resolve spontaneously in 2 ‑ 10 weeks. | | *Lesions are nonirritant and usually resolve spontaneously in 2 ‑ 10 weeks. |
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| ===Microscopic Lesions=== | | ===Microscopic Lesions=== |
| *Skin biopsy reveals superficial perivascular dermatitis with psoriasiform epidermal hyperplasia. | | *Skin biopsy reveals superficial perivascular dermatitis with psoriasiform epidermal hyperplasia. |
− | *The superficial dermis usually shows mild to moderate mucinous degeneration, and eosinophils and neutrophils are the predominant inflammatory cell types. | + | *The superficial dermis usually shows mild to moderate mucinous degeneration, and eosinophils and [[Neutrophils|neutrophils]] are the predominant inflammatory cell types. |
− | *Intra-epidermal pustules containing eosinophils and neutrophils are prominent in early lesions. | + | *Intra-epidermal pustules containing eosinophils and [[Neutrophils|neutrophils]] are prominent in early lesions. |
| *Parakeratotic hyperkeratosis is usually prominent. | | *Parakeratotic hyperkeratosis is usually prominent. |
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| ===Differential Diagnosis=== | | ===Differential Diagnosis=== |
| #Dermatophytosis ‑ (etio: Tr. mentagrophytes, M. canis, Tr. verrucosum var. discoides, M. nanum, Tr. rubrum) Ruled‑out due to lack of mycotic organisms. | | #Dermatophytosis ‑ (etio: Tr. mentagrophytes, M. canis, Tr. verrucosum var. discoides, M. nanum, Tr. rubrum) Ruled‑out due to lack of mycotic organisms. |
− | #[[Skin - infectious#Greasy pig disease|Exudative epidermitis (greasy pig disease)]] ‑ (''Staphylococcus hyicus'') Early lesions may appear as red plaques, but soon become exudative and ulcerated; R/O based on culture, lesion distribution, histopathology. | + | #[[Skin Infectious - Pathology#Greasy pig disease|Exudative epidermitis (greasy pig disease)]] ‑ (''Staphylococcus hyicus'') Early lesions may appear as red plaques, but soon become exudative and ulcerated; R/O based on culture, lesion distribution, histopathology. |
| #Dermatosis vegetans ‑ Systemic, erythematous maculopapular dermatitis caused by the inheritance of a autosomal recessive, semilethal factor. Skin, coronary band and hoof lesions, giant cell pneumonia, fatal. | | #Dermatosis vegetans ‑ Systemic, erythematous maculopapular dermatitis caused by the inheritance of a autosomal recessive, semilethal factor. Skin, coronary band and hoof lesions, giant cell pneumonia, fatal. |
| #Swinepox ‑ Ballooning degeneration and intracytoplasmic inclusion bodies. | | #Swinepox ‑ Ballooning degeneration and intracytoplasmic inclusion bodies. |
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| ===Postgraduate=== | | ===Postgraduate=== |
| Kate | | Kate |
| ::''IL-3 is involved... Vet Path (2007) 34: 45-43'' | | ::''IL-3 is involved... Vet Path (2007) 34: 45-43'' |
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| + | [[Category:To Do - Dermatology]][[Category:To Do - Medium]] |
| + | [[Category:Integumentary System - Developmental Pathology]][[Category:Dermatological Diseases - Pig]] |