EXHIBIT 3.58

                                     BYLAWS
                                       OF
                        BHC LEBANON KOALA HOSPITAL, INC.

         1. Annual Meeting of the Shareholders. The annual meeting of
shareholders for the election of directors and such other purposes as may be set
forth in the notice of meeting shall be held at the time and place, within or
outside the State of Tennessee, fixed by the board of directors.

         2. Special Meetings of the Shareholders. Special meetings of the
shareholders may be held at any place within or outside the State of Tennessee
upon call of the board of directors, the chairman of the board of directors, if
any, the president, or the holders of at least ten percent of the issued and
outstanding shares of capital stock entitled to vote.

         3. Transfer of Stock. The capital stock of the Corporation shall be
transferred on the books of the Corporation by surrender of properly endorsed
certificates therefor by the holders thereof or their duly authorized
attorneys-in-fact. In case of transfer by attorney, the power of attorney, duly
executed and acknowledged, shall be deposited with the secretary. The person in
whose name stock stands on the books of the Corporation shall be deemed by the
Corporation to be the owner thereof for all purposes.

         4. Directors. The business of the Corporation shall be managed by a
board of directors consisting of not less than two nor more than seven members,
such number of directors within such range to be fixed by action of the board of
directors. The range of size for the board may be increased or decreased by the
shareholders. Vacancies in the board of directors, whether resulting from an
increase in the number of directors, the removal of directors for or without
cause, or otherwise, may be filled by a vote of a majority of the directors then
in office, although less than a quorum. Directors may be removed for or without
cause by the shareholders.

         5. Meetings of the Board of Directors. Regular meetings of the board of
directors may be held without notice of the date, time, place or purpose of the
meeting (a) at the location of the annual meeting of shareholders immediately
after the meeting in each year and (b) at such times and at such places within
or outside the State of Tennessee as shall be fixed by the board of directors.
Special meetings of the board of directors may be held at any place within or
outside the State of Tennessee upon call of the chairman of the board of
directors, if any, the president or a majority of the directors then in office,
which call shall set forth the date, time and place of meeting and, if required
by law, the purpose of the meeting. Written, oral, or any other mode of notice
of the date, tune and place of meeting shall be given for special meetings in
sufficient time, which need not exceed two days in advance, for the convenient
assembly of the directors. A majority of the number of directors of the
Corporation then in office, but in no event less than one-third of the number of
directors the Corporation would have if there were no vacancies in the board of
directors, shall constitute a quorum, and the vote of



a majority of the directors present at the time of the vote, if a quorum is
present, shall be the act of the board of directors.

         6. Officers. The board of directors shall elect a president and
secretary, and such other officers as it may deem appropriate. The president,
secretary, and any other officer so appointed by the board of directors are
authorized to execute certificates representing shares of the Corporation's
capital stock. Persons may hold more than one office except that no person may
serve as both president and secretary. Officers shall have the authority and
responsibilities given them by the board of directors, and each officer shall
hold office until his successor is elected and qualified, unless a different
term is specified by the board of directors.

         7. Committees. By resolution adopted by the greater of (i) a majority
of the directors of the Corporation then in office when the action is taken or
(ii) the number of directors required by the Charter or bylaws to take action,
the directors may designate from among their number one or more directors to
constitute an executive committee and other committees, each of which, to the
extent permitted by law, shall have the authority granted it by the board of
directors.

         8. Amendment of Bylaws. The bylaws of the Corporation may be amended or
repealed, and additional bylaws may be adopted, by action of the board of
directors or of the shareholders, but any bylaws adopted by the shareholders may
be amended or repealed only by the shareholders.

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