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A 88 year old male patient presents with worstening urinary incontinence for the past 2 months. The patient has had urinary incontinence for the past 12 years. The incontinence occurs usually during the day and starts with an intense feeling of going to the toilet followed by incontinence.

The patient has a past history of appendicectomy.

Physical examination reveals clear lung fields, heart regular rhythmic, abdomen soft non tender, genitalia had no apparent disorder. Blood tests and urinary tests were unremarkable.

What is your diagnosis?