anterior mediastinum


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an·te·ri·or me·di·as·ti·num

[TA]
the narrow nearly potential space between the pericardium posteriorly and the sternum anteriorly that contains the thymus or its remnants, some lymph nodes, and the vessels and branches of the internal thoracic artery.
Synonym(s): mediastinum anterius [TA]

anterior mediastinum

a caudal portion of the mediastinum in the middle of the thorax, bounded ventrally by the body of the sternum and parts of the fourth through the seventh ribs and dorsally by the parietal pericardium, extending downward as far as the diaphragm. Compare middle mediastinum, posterior mediastinum, superior mediastinum.
References in periodicals archive ?
The anterior mediastinum is bounded anteriorly by the sternum and posteriorly by a line drawn from the anterior aspect of the trachea and along the posterior heart border.
Chest CT scan revealed the same 4-cm mass surrounding the left upper lobe bronchus and a 2-cm lymph node in the anterior mediastinum.
Together, these structures descend to their final anatomic positions in the anterior mediastinum.
0-cm soft-tissue mass adjacent to the trachea in the anterior mediastinum.
In normal embryologic development, the thymic primordia migrates from the pharynx caudally and fuses in the anterior mediastinum along the course of the thymopharyngeal duct.
A CT scan revealed a huge mass that occupied the entire anterior mediastinum with posterior and caudal displacement of both lungs (Fig.
Dermoid cysts (also referred to as mature cystic teratomas) are benign neoplasms that can occur in many locations, but are most commonly seen in the gonads, head and neck, anterior mediastinum, sacrococcygeal area, retroperitoneum, and central nervous system (CNS).
5 X 6 cm mass in the left anterior mediastinum contiguous with the left anterior lung.
Repeat CT of the neck and chest demonstrated (1) subcutaneous air in the neck bilaterally that extended from the floor of the mouth to the superior and anterior mediastinum, tracking along the area of the superficial cervical fascia, and (2) bilateral pleural effusions (figure 1).
11) With respect to these cases, it is important to remember that as many as 10% of seminomas may be extragonadal in origin; such tumors typically occur in the anterior mediastinum, retroperitoneum, or pineal region.
The second was an infection beginning at the soft palate and extending to the anterior mediastinum.
After the sixth week of fetal life, it descends to its final position in the anterior mediastinum adjacent to the parietal pericardium.

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