
INFO/WWW-LINKS: 
    Tracheal tumors may be divided in benign (e.g. 
    Cartilaginous tumor (hamartoma), Squamous cell papilloma, Fibroma / lipoma, 
    Hemangioma, Granular cell myoblastoma, Granuloma (inflammatory, TB, fungus) 
    and Amyloid tumor) and malignant tumors( e.g. 
    Squamous-cell carcinoma (commonest primary) Adenoid cystic carcinoma 
    = cylindroma, Metastasis from renal cell carcinoma, colon cancer, malignant 
    melanoma; Lymphoma;Plasmacytoma) 
    Causes 
    of pleural effusion are ususally divided by the effusion`s protein concentration 
    into transudates (<30g/l) and exsudates (>30g/l). Reasons for transudates 
    are e.g. heart failure, liver failure, nephrotic syndrome. Reasons for exsudates 
    are e.g. pneumonia, TB, empyema, lung carcinoma. 
