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| Side | Boundary |
| Upper (cranial) | Inferior wall of pericardium and pulmonary ligament |
| Lower (caudal) | Diaphragm hiatus |
| Lateral | Mediastinal pleura |
| Front (ventral) | Anterior inferior wall of pericardium and diaphragm |
| Back (dorsal) | Anterior wall of aorta |
