a permanent fistula (for example, caecostomy, colostomy, laryngostomy or ileostomy) requiring continuous surgical dressing or requiring an appliance
ffistwla parhaol (er enghraifft, caecostomi, colostomi, laryngostomi neu ileostomi) sy’n golygu bod angen gorchuddion llawfeddygol parhaus neu gyfarpar