Fetus papyraceus-A surprise finding in a "normal" placenta

Area of Science:

• Perinatology
• Embryology
• Obstetrics

Background:

• Single fetal demise in twin gestations presents varied outcomes depending on the timing of death.
• The developmental trajectory of the deceased twin can range from resorption to mummification or maceration.

Observation:

• A unique case of an undiagnosed fetus papyraceus was incidentally discovered within an otherwise normal placenta.
• This finding highlights the potential for asymptomatic cases of fetal papyraceus.

Findings:

• Fetus papyraceus, a mummified twin, results from mechanical compression following second-trimester demise.
• Third-trimester demise typically leads to maceration, while first-trimester demise may result in resorption ('vanishing twin').

Implications:

• Identifying fetus papyraceus is vital due to potential severe maternal hematological and surviving twin neurological complications.
• Accurate diagnosis aids in understanding twin gestation demise and has medicolegal relevance for obstetric care.
• This case contributes to the knowledge of embryological development and fetal demise in multiple gestations.