Singap Med J
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Methylene blue is a vital dye that is used in the treatment of methaemoglobinaemia. It is also used to delineate tissues to facilitate identification during surgery. ⋯ However, there have not been any previous reports of urinary discoloration after brief rectal instillation of the dye. We report a case of self-limiting urinary discoloration after anterior resection with colorectal anastomosis.