Quadricuspid pulmonary valve: macroscopic and microscopic morphometric examination.

Area of Science:

• Cardiovascular Pathology
• Embryonic Development
• Congenital Heart Variations

Background:

• Pulmonary valve anatomy typically includes three leaflets.
• Congenital heart anomalies can arise from developmental disturbances.

Observation:

• Autopsy revealed a quadricuspid pulmonary valve in a 26-year-old male.
• An additional, smaller leaflet was present between the left anterior and right anterior leaflets.
• Microscopic examination showed differences in myocardial sleeve extension and autonomic nerve presence compared to normal leaflets.

Findings:

• The quadricuspid pulmonary valve exhibited structural variations in leaflet thickness and extracellular matrix.
• Myocardial sleeves did not extend to the hinge line of the additional leaflet.
• Absence of autonomic nerves in the surrounding adipose tissue of the additional leaflet was noted.

Implications:

• This quadricuspid pulmonary valve is likely due to abnormal embryonic development.
• Such anatomical variations may necessitate modified clinical management strategies for affected patients.
• Understanding these variations is crucial for accurate diagnosis and treatment of congenital heart disease.