Exhibit 10.55


                                December 26, 2001


Heller Healthcare Finance, Inc.
f/k/a HCFP Funding, Inc.
2 Wisconsin Circle, 4th Floor
Chevy Chase, Maryland 20815
Attention:  David Moore, Senior Vice President

Dear Mr. Moore:

Reference is made to that certain Loan and Security  Agreement  originally dated
as of February 18, 1998 by and among the Borrowers identified therein and Heller
Healthcare  Finance,  Inc.  f/k/a HCFP Funding,  Inc., as Lender (as  previously
amended,  as amended hereby and as otherwise  amended,  modified or supplemented
from time to time, the "Loan  Agreement").  All  capitalized  terms used but not
defined in this letter (this  "Letter  Agreement")  shall have the meaning given
them in the Loan Agreement.

We are writing to request that Lender agree to lend and Borrower hereby agree to
make an additional  Revolving  Credit Loan in the form of an "overline  advance"
(i.e.,  an advance  which exceeds the Borrowing  Base).  We understand  that the
Lender has agreed to provide such overline advance,  provided the Borrower agree
to the terms and  conditions  set forth  herein.  Accordingly,  the Borrower and
Lender hereby agree as follows:

     1. The aggregate  amount of all advances under the June Overline Loan shall
not exceed One Hundred  Fifty  Thousand and No/100  Dollars  ($150,000.00)  (the
"Overline  Loan").  The  Overline  Loan shall bear  interest at the Base Rate as
specified in the Loan Agreement.

     2. Except as expressly modified by the terms of this Letter Agreement,  the
Overline Loan will be treated for all purposes as a Revolving  Credit Loan under
the Loan  Agreement,  and all  principal,  interest,  fees and  other  costs and
expenses  relating to the Overline Loan (the  "Overline  Obligations")  shall be
treated as additional  Obligations  under the Loan  Agreement and the other Loan
Documents.  The Maximum  Loan  Amount  shall be  inclusive  of, and shall not be
deemed to be increased by, the Overline Obligations.

     3. The Overline  Loan shall be repaid in full by Borrower  making  fourteen
(14) consecutive  principal  payments each equal to $10,000 beginning on January
4, 2002 and  continuing  through and  including  April 5, 2002,  and by Borrower
making a final payment on April 12, 2002 (the "Maturity  Date") equal to $10,000
plus all then outstanding Overline Obligations.

     4. In  consideration  for  Lender's  agreement  to enter  into this  Letter
Agreement  with  Borrower,  Borrower  hereby  agrees to pay to Lender a fee (the
"Overline  Fee") equal to Three  Thousand Seven Hundred Fifty and No/100 Dollars
($3,750.00).  The  Overline Fee shall  constitute  a portion of the  Obligations
evidenced  and  secured  by the Loan  Documents  and  shall  be due and  payable
promptly  following demand therefor by Lender. To the extent that Borrower shall
not have paid the  Overline Fee promptly  following  demand  therefor by Lender,
Borrower shall be deemed to have authorized and hereby does authorize  Lender to
deduct the amount of such  Overline Fee from the proceeds of the any  subsequent
Revolving Credit Loan(s) made by Lender to Borrower under the Loan Agreement. In



addition,  Borrower  shall pay Lender for all  reasonable  costs and expenses of
Lender  (including  but not  limited  to the  reasonable  documentation  fees of
Lender's  in-house  counsel) in connection with the preparation of this Overline
Letter.

     5.  Any  breach  by  Borrower  of any  of the  provisions  of  this  Letter
Agreement,  including  but not  limited to any  failure of Borrower to repay the
Overline Obligations on or before the Maturity Date as required hereunder, shall
constitute an immediate and automatic  Event of Default under the Loan Agreement
without further action or notice by Lender. Upon the occurrence of such an Event
of Default,  and in addition to the other rights to which Lender may be entitled
under the Loan  Agreement,  or at law or in equity,  upon such  failure,  Lender
shall be entitled to apply  amounts  transferred  to the  Concentration  Account
pursuant to Section 2.3 of the Loan  Agreement  in  satisfaction  of  Borrower's
obligations with respect to the Overline Loan and the Overline Obligations.

     6.  Except as  specifically  modified by this  Letter  Agreement,  the Loan
Agreement, and all other Loan Documents,  shall remain in full force and effect,
and are hereby ratified and confirmed.

     7. The execution, delivery and effectiveness of this Letter Agreement shall
not,  except as  expressly  provided  herein,  operate as a waiver of any right,
power or remedy of Lender,  nor constitute a waiver of any provision of the Loan
Agreement,  or any other  documents,  instruments  and  agreements  executed  or
delivered in connection therewith,  nor shall it be construed as a waiver of any
other Event of Default, whether now existing of hereafter arising. Lender hereby
reserves all of its rights and remedies  under the Loan Documents and applicable
law.

     8. This Letter  Agreement  shall be governed by and construed in accordance
with  the  laws  of the  State  of  Maryland  without  regard  to any  otherwise
applicable conflicts of law provisions thereof.

     9. This Letter  Agreement  may be executed in  counterparts,  each of which
shall be deemed to be an original and all of which together shall constitute one
and the same instrument.

     10. By execution and delivery of this Letter Agreement, the Borrower agrees
to be legally bound by the provisions hereof.

                              Very truly yours,

                              PHC OF MICHIGAN, INC.
                              PHC OF UTAH, INC.
                              PHC OF VIRGINIA, INC.,
                              each a Massachusetts corporation


                              By: /s/ Paula C. Wurts
                              Name:   Paula C. Wurts
                              Title:  Chief Financial Officer




            [LENDER'S ACKNOWLEDGEMENT SIGNATURE APPEARS ON NEXT PAGE]





ACKNOWLEDGED AND AGREED TO
as of this ____ day of December, 2001:


HELLER HEALTHCARE FINANCE, INC.
f/k/a HCFP FUNDING, INC., a Delaware corporation

By:  ____________________________________________
Name:
Title: