Injected fluid or elemental mercury (for ritual purpose, in Munchausen syndrome, in illicit drug abusers or secondary to failure of vintage hemodynamic pressure sensors) may lodge in the pulmonary circulation causing distinctive imaging features. To be ditinguished from mercury salts and/or organomercurials and their distinctive toxicity (PMID 9614258). These are extremely hazardous poisons and supertoxicants (PMID 9614258, 14585942). Review on the toxic effects of mercury at PMID 28662415 and on environmental mercury at PMID 24744824