In 1999, a World Health Organization (WHO) Working group suggested a non-committal terminology (Masaoka<unk>  for thymoma, preserving the distinct categories of the histo-genetic<unk> , by using letters and numbers to designate tumor entities. Recently, it has been very well accepted as it provides an easy comparison of clinical, pathological, and immunological studies.
Thymoma classification
Thymoma staging
Pancoast tumor classification
Lung abscess classification
Thymoma physical examination
Thymic carcinoma staging
Hemoptysis classification
Osteosarcoma classification