Is there any centralized cryptocurreny? Is there any centralized cryptocurrency? Is cryptocurrency a Bitcoin oriented concept only? From what i read almost all of the cryptocurrencies are derivatives of Bitcoin.
I think you are correct that almost all of the cryptocurrencies are derivatives of Bitcoin.  From that fact it would follow that they would all be decentralized.

That being said, there are centralized aspects of cryptocurrencies, including Bitcoin.  For example, online wallets, exchanges and mining pools are all centralized.