Classification of Tumours

CLASSIFICATION(based- on the histogenesis (ie, cell. of origin) and on the anticipated behavior)

Tissue of Origin Benign Malignant
I. TUM0URS OFONE
PARENCHYMAL CELL TYPE
A. Epithclial Tumours
1. Squamous epithelium Squamous cell papilioma Squamois cellcarcinoma
2. Transitional epitheliun1 Transitional cell papilloma Transitional cell carcinoma
3. Glandular epithelium Adenoma Adenocarcinoma
4. Basal cell laver skin cC Basal cellcarcinoma
5. Neuroectodern (Melanocarcinoma) Naevus Melanoma
6. Hepatocytes Liver cell adenoma Hepatoma
7. Placenta (Chorionic epithelium) Hydatidiform mole Choriocarcinoma
B. Non-epithelial (Mesenchymal)
Tumours
1. Adipose tissue Lipoma
2. Adult fibrous tissue Liposarcoma
3. Ennbryonic fibrous tissue
Fibroma Fibrosarcoma
Myxoma Myxosarcoma
4. Cartilage Chondroma
5. Bone Chondrosarcoma
Osteoma Osteosarcoma
6. Synoviun1 Benign synovioma Synovial sarcoma
7. Smooth muscle
8. Skeletal muscle Leiomyoma Leiomyosarcoma
9. Mesothelium
Rhabdomnyoma Rhabdomyosarcoma
10. Blood vessels
Mesothelioma
11. Lymph vessels
Haemangioma Angiosarcoma
12. Glomus
Lymphangioma Lymphangiosarcoma
Glomus tumour
13. Meninges Meningioma Invasive meningioma
14. Haematopoietic cells Leukaemnias
15. Lymphoid tissue Pseudolymphoma Malignant lymphomas
l6. Nerve sheath
17. Nerve cells Neurilemmoma,Neurofibroma Neurogenic sarcoma
Ganglioneuroma Neuroblastoma
II. MIXED TUMOURS

Salivary glands Pleomorphic adenoma Malignant mixed salivary
(mixed salivary tumour) tumour


II. TUMOURS OF MORE THAN
ONE GERM CELL LAYER
Totipotent cells in gonads or
in embryonal rests Mature teratoma Immature teratoma