Dear Mr/ Ms ......
I am writing this letter on behalf of Ms..... who had been diagnosed with gynaecological tumour that needs immediate medical attention including surgery. I had enclosed her medical certificate with this letter and would like to request for a month of medical leave for her.
Ms.... has assured me of her immediate return to her responsibilities as soon as she is better and we would be grateful for your kind consideration and prompt decision on this matter.
Yours sincerely,