Morphological variations on vital systems in a conjoined twin

Area of Science:

• Anatomical Pathology
• Developmental Biology
• Medical Imaging

Background:

• Conjoined twins (CTs) are rare, arising from monochorionic and monoamniotic pregnancies.
• Dicephalus dibrachius dipus, a specific type of parapagus CT with two heads, two arms, two legs, and a single trunk, is exceptionally rare.
• This study focuses on a well-preserved anatomical specimen of this rare condition.

Purpose of the Study:

• To present a detailed anatomical description of a rare dicephalus dibrachius dipus conjoined twin specimen.
• To document major abnormalities in the cardiovascular, respiratory, and digestive systems.
• To highlight a unique finding of a three-atria heart in conjoined twins.

Main Methods:

• Observational analysis of a donated anatomical specimen.
• Computed tomography (CT) scans for internal imaging.
• 3D reconstruction from CT data for detailed visualization.

Main Results:

• The specimen exhibited major abnormalities in cardiovascular, respiratory, and digestive systems.
• Internal anatomy revealed a heart with three atria, two ventricles, two aortic arches, and two pulmonary arteries.
• The respiratory system included two tracheas and four lungs, with a single innominate venous trunk.

Conclusions:

• This case provides a comprehensive anatomical description of a rare dicephalus dibrachius dipus conjoined twin.
• The unique three-atria heart finding is significant and not previously reported in similar cases.
• The detailed anatomical data is valuable for future research on conjoined twins.