20th July 2020

A 42-year-old woman is brought into accident and emergency by ambulance complaining of severe anorectal pain

A 42-year-old woman is brought into accident and emergency by ambulance complaining of severe anorectal pain, fever and malaise. She has an elevated white cell count of 15 x 10⁹ (normal range 4-11 x 10⁹) and an elevated CRP. 

Please select the SINGLE most likely diagnosis. Select ONE option from the list above.