What is the Difference Between Lung Mass and Mediastinal Mass?

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The main difference between a lung mass and a mediastinal mass lies in their locations and the structures they arise from.

  • Lung Mass: A lung mass is an abnormalspot or area that arises solely within the lungs. It is an abnormal growth that forms due to an imbalance between cell growth and cell death.
  • Mediastinal Mass: A mediastinal mass is an abnormal spot or area that arises from structures within the mediastinum, which is the space between the lungs. Mediastinal masses can be various types, including thymomas, lymphomas, germ cell tumors, and cysts.

In terms of radiographic appearance, a lung mass abuts the mediastinal surface and creates acute angles with the lung, while a mediastinal mass sits under the surface, creating obtuse angles with the lung. Both lung and mediastinal masses can be benign or malignant, and they are treatable.

Comparative Table: Lung Mass vs Mediastinal Mass

Here is a table comparing the differences between lung mass and mediastinal mass:

Feature Lung Mass Mediastinal Mass
Definition An abnormal spot or area located within the lungs. An abnormal spot or area located within the mediastinum.
Location Occurs within the lung tissue. Occurs within the mediastinum, which contains the heart and other structures.
Characteristics Lung masses are typically shaped by the lung's architecture and may have acute angles with the lung. Mediastinal masses sit under the surface and may not have acute angles with the lung.
Common Types Lung masses can be caused by various conditions, including nodules, tumors, and infections. Mediastinal masses can be caused by thymomas, neurogenic tumors, benign cysts, lymphadenopathy, and more.
Age of Onset Lung masses can affect individuals of any age group. Mediastinal masses mostly affect the 30 to 50 years age group.
Diagnosis Lung masses can be diagnosed using various imaging techniques, such as X-rays, CT scans, and MRI. Mediastinal masses can be diagnosed using similar imaging techniques, with additional clues from the clinical history and anatomical position.

Please note that these are general characteristics and may not apply to every case. The specific features of a mass will depend on its underlying cause and individual circumstances.