Postmortem computed tomography imaging of negative pressure pulmonary edema induced by rice cakes: A case report

Airway obstruction by foreign bodies or laryngospasms often results in negative pressure pulmonary edema (NPPE). NPPE can develop despite the removal of airway obstruction. This is well-known among clinicians, particularly anesthesiologists, emergency physicians, pediatricians, and radiologists. Computed tomography (CT) features of NPPE include diffuse central ground-glass opacities and thickening of the bronchovascular bundles and bronchial walls. NPPE can also occur after strangulation or smothering with a plastic bag, and is sometimes fatal. Nevertheless, no reports of NPPE are available in forensic journals, and forensic practitioners may not be dedicating the necessary attention to this condition. Recently, the use of postmortem CT as an auxiliary imaging modality for autopsies has increased among forensic institutions in Japan. Understanding the mechanisms and CT findings of NPPE will be useful for forensic practitioners. Herein, we present a case wherein the postmortem CT image revealed NPPE resulting from the obstruction of the airway induced by rice cakes.

Automated summary

Negative pressure pulmonary edema (NPPE) can occur after airway obstruction by foreign bodies or laryngospasms, and even if the obstruction is removed. The CT features of NPPE include diffuse central ground-glass opacities and thickening of the bronchovascular bundles and bronchial walls. Forensic practitioners may not be aware of NPPE, but understanding its mechanisms and CT findings can be useful for them.