‘Fleetwood Mac’ keyboardist Christine McVie died of a massive stroke, after being diagnosed with an aggressive form of cancer.

According to the singer’s death certificate and will, obtained by The Blast, McVie was diagnosed with, ‘metastatic malignancy of unknown primary origin,

which essentially means cancer had spread in her body where the primary source or tumor is not detected

The National Institute of Health describes it as, “a metastatic tumor for which the site of origin is not suggested by a thorough history

physical examination, chest x-ray studies, routine blood and urine studies, and histologic evaluation.”

Unfortunately, McVie suffered an “ischaemic stroke” which ultimately caused her death. The cancer is listed as a secondary cause of the musician’s passing

This specific type of stroke is described as “a blood clot blocks or narrows an artery leading to the brain.