Mr Berezovsky, 67, was discovered at his Berkshire home on Saturday.
A post-mortem examination found his death was consistent with hanging, but further tests are being carried out and are likely to take several weeks.
The inquest, which has been adjourned, comes after relatives of his second wife described him as "extraordinary".
Speaking at the opening of the inquest at Windsor Coroner's Court, Detective Inspector Mark Bissell, of Thames Valley Police, said Mr Berezovsky was found lying on his bathroom floor with a "ligature around his neck and a piece of similar material on the shower rail above him".
The inquest was opened and adjourned by Berkshire Coroner Peter Bedford.
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