Kidney cyst. Kidney cysts are round pouches of fluid that form on or in the kidneys. Kidney cysts can be associated with serious disorders that may impair kidney function. But more commonly, kidney cysts are a type called simple kidney cysts â noncancerous cysts that rarely cause complications.
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Portable oxygen concentrator. Portable oxygen concentrator (POC) is a portable device used to provide oxygen therapy to chronic patients at greater oxygen concentrations than the levels of ambient air. It is similar to a home oxygen concentrator, but is smaller in size and more mobile. The portable oxygen concentrator makes it easy for patients to travel freely; they are small enough to fit in a car and many concentrators are now FAA-approved for use on airplanes. 1 Development.