Mysterious overnight disappearance of mediastinal mass

[Mediastinal mass].

Posterior Mediastinal Mass

A 57-year-old woman presented with epigastric pain and cough for a period of 15 days, as well as a history of significant weight loss of 12 kgs in past 2 months. The patient had no significant past medical history. A chest x-ray was performed (Fig. 1), which prompted further work-up, consisting of a contrast-enhanced CT (Fig. 2) MRI (not shown), and PET-CT (Fig. 3). Frontal chest radiograph don...

Anterior mediastinal mass.

THE image depicts an anterior mediastinal mass in a 4-yr-old who presented with numbness in the left arm. A large soft tissue mass can be seen in the anterior mediastinum. The mass extended into the neck and displaced the great vessels in the mediastinum and major vessels in the left neck. The airway and thyroid were deviated toward the right. The trachea was narrowed slightly at its midportion...

Unusual cause of mediastinal mass.

Manchanda S, et al. BMJ Case Rep 2017. doi:10.1136/bcr-2017-219852 Description A 35-year-old asymptomatic man presented for chest radiograph evaluation as a part of pre-employment medical examination. The radiograph revealed a large, dense homogenous mass with sharply defined margins and a broad base towards the mediastinum overlying the right hilum. There was also evidence of linear calcificat...

Environmental stochasticity in dispersal areas can explain the "mysterious" disappearance of breeding populations.

We present the results of an individual-based simulation model, showing that increasing the mortality of non-breeding dispersers within settlement areas can lead to the extinction of species and (meta)populations in a subtle way. This is because the areas where dispersers settle are generally unknown or difficult to detect. Consequently, fewer efforts are devoted to the conservation of these si...