All is now set for President Muhammadu Buhari to undergo surgery for the removal of a mass in his body believed to be cancerous at Royal Brompton Hospital in the United Kingdom, SaharaReporters has gathered. The hospital is situated at Sydney St, London SW3 6NP. Meanwhile, sources said even though the procedure will keep President Buhari away for at least two weeks, he refused to hand over to Vice President Yemi Osinbajo. Mass in medicine is a lump in the body. It may be caused by the abnormal growth of cells, a cyst, hormonal changes, or an immune reaction.