Leiomyomatosis peritonealis disseminata. An ultrastructural study

Area of Science:

• Reproductive biology
• Cell biology
• Pathology

Background:

• Leiomyomatosis peritonealis disseminata (LPD) is a rare condition characterized by widespread smooth muscle nodules.
• Its histogenesis and cell of origin remain subjects of investigation, particularly in relation to hormonal influences.

Observation:

• Electron microscopy of the eighth documented case revealed mature leiomyocytes as the primary proliferative cells.
• Myofibroblasts, exhibiting characteristics of both fibroblasts and leiomyocytes, were also observed.

Findings:

• The study proposes that LPD arises from a multicentric metaplastic change.
• This change is attributed to an abnormal tissue response to elevated hormonal levels, such as those during pregnancy or from ovarian tumors.
• The multipotent subcelomic mesenchymal cell is suggested as the cell of origin, capable of differentiating into smooth muscle.

Implications:

• Understanding the cell of origin and metaplastic nature of LPD is crucial for diagnosis and management.
• Myofibroblasts may represent a transitional stage, offering insights into the differentiation pathway.
• Further research into hormonal influences on mesenchymal cell differentiation could elucidate LPD pathogenesis.