1 Kidney stones. Large kidney stones cannot enter the ureter but a stone less than 5mm in diameter can cause a sudden obstruction.  Blood clots may obstruct the ureter and this is usually seen with massive hematuria (blood in the urine). Bleeding in these cases may be due to tumors, papillary necrosis or kidney stones.
Depreciation is a concept in accounting used to measure a reduction in the value of fixed assets, such as buildings, equipment, leasehold improvements, and vehicles. As these fixed assets are used in the course of a business' operations, they experience wear and their future value is reduced.
IRS Depreciation Methods. Depreciation is a tax deduction for long-lived business and investment property. You normally cannot expense the full purchase cost of business property in one year but must spread out the deductions over the propertyâs ârecovery period.â Different types of properties have different recovery periods.