Postmortem changes in ancient Egyptian child mummies: Possible pitfalls on CT images.

Objective: To identify and interpret computed tomography (CT) findings of postmortem changes in ancient Egyptian child mummies.

Materials: Whole-body CT examinations of 21 ancient Egyptian child mummies from German (n = 18), Italian (n = 1), and Swiss museums (n = 2).

Methods: Conspicuous CT findings from prior evaluations with various research questions that were assessed as postmortem changes were classified, and special cases were illustrated and discussed.

Results: Postmortem changes were classified into several categories. From these, individuals with evidence of invasion of resin/oil/tar into bone, dried fluid-levels within bone most likely due to natron, probable interaction of natron with soft tissues and bone, as well as insect infestation were demonstrated.

Conclusions: One challenge of paleoradiology is to differentiate between intravital and postmortem changes, which can be multifarious. These changes can be obvious, but also subtle, and can mimic diseases.

Significance: The provided classification of postmortem changes, as well as the demonstrated cases, may serve as models for further paleoradiological investigations. The dried intraosseous fluid levels in two mummies, most likely due to natron, suggests that these children were immersed in a liquid natron bath, in contrast to the current scientific view that natron for mummification was routinely applied in the solid form.

Limitations: CT was used as the only examination method, as sampling of the mummies was not possible.

Suggestions For Further Research: The awareness that postmortem changes on CT images of ancient Egyptian mummies might mimic pathology should be raised to reduce or avoid incorrect interpretation.