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Glomerulonephritis develops with concurrent polyuria and polydipsia together with progressive weight loss. Macroscopic pathology will show neoplastic lesions within the kidneys which will be shrunken, fibrotic and pitted.   
 
Glomerulonephritis develops with concurrent polyuria and polydipsia together with progressive weight loss. Macroscopic pathology will show neoplastic lesions within the kidneys which will be shrunken, fibrotic and pitted.   
 
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===Aural Cholesteatomas===
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Spontaneous aural cholesteatomas occur in 50% of gerbils over the age of two. The tumor displaces the tympanum of the ear into the middle ear. Clinical signs include a head tilt.
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Macroscopic pathologic findings will include compression within the inner and middle ear. There is often secondary infection in the ear which results in some bone necrosis and inner ear destuction.
 
[[Category:Laboratory Animal Pathology]]
 
[[Category:Laboratory Animal Pathology]]
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