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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10.6k Views. OPC typically means Ordinary Portland Cement. This is standard concrete used for many purposes. PPC mean Pozzolanic Portland Cement. Pozzolans are siliceous material than can be added to concrete mixtures, potentially lower the mix cost without harming the performance characteristics.rdinary Portland Cement (OPC) and Portland Pozzolana cement (PPC) differ primarily in their composition ultimately affecting its applicability. PPC commonly has pozzolan material added to cement (either before clinkering or added to ground clinker). Pozzolan commonly used is fly as and is put upto 15%.