A first year student in her first month of clinicals in a general surgery ward is asked to give a report of her patient to her clinical instructor:

"My patient Mr. x, is a 45 year old gentleman, who has been diagnosed to have a calcium stomach ..."

The instructor was confused, as she had never heard of a calcium stomach. When she opened the patient's history sheet, it turned out to be carcinoma - Ca Stomach.

it is posted under nursing humor so it is probably a joke