Cervico-pectoral ectopia cordis in two Holstein calves

Area of Science:

• Veterinary Pathology
• Developmental Biology
• Congenital Abnormalities

Background:

• Ectopia cordis is a rare congenital condition where the heart is abnormally positioned outside the thoracic cavity.
• Cervico-pectoral ectopia cordis, a specific form, presents significant challenges in understanding its developmental origins and associated pathologies.

Observation:

• Macroscopic and radiographic examination of two Holstein calves revealed severe ectopia cordis with variations in heart coverage and sternal defects.
• Detailed anatomical assessment identified duplicated cranial vena cava, abnormal sternal fusion, and unique aortic arch branching patterns.
• Associated anomalies included torticollis, cleft palate, and urogenital system abnormalities in both specimens.

Findings:

• The study identified a shared embryological pathogenesis for cervical and pectoral ectopia cordis, with cervical occurring earlier in fetal development.
• Arterial branching patterns were intermediate between canine and porcine models, suggesting species-specific developmental pathways.
• A single pulmonary vein entering the left atrium was consistently observed in both affected calves.

Implications:

• Understanding the teratogenesis of ectopia cordis aids in diagnosing and potentially managing similar congenital defects in veterinary medicine.
• This research provides insights into early embryonic development and the complex interplay of factors leading to severe congenital anomalies.
• The findings contribute to the comparative anatomy and embryology of cardiovascular development across different mammalian species.