Pilonidal sinus (pilonidal cyst) removal
A pilonidal cyst (also called a pilonidal sinus, or buttock abscess) is a subcutaneous cavity and duct system that usually develops between the buttocks, in the sacrum area (i.e., above the tailbone at the top of the buttocks). Its name derives from the Latin words ‘pilus’ (hair) and ‘nidus’ (nest), because the cyst often contains hair that for some reason becomes embedded under the skin