Benign & Malignant Tumours of Oral Cavity

Definitions Neoplasia Difference between Hyperplasia & Tumour Tumour is an abnormal mass of tissue, the growth of which exceeds and is uncoordinated with that of normal tissues and persists in the same excessive manner after cessation of stimuli which evoked the change. - Willis

Hamartoma : An abnormal proliferation of tissues, native to that part Hamartoma : An abnormal proliferation of tissues, native to that part. It is a focal malformation which resembles a neoplasm, grossly & Microscopically

Teratoma: A neoplasm composed of tissues not normally found in the organ, in which it arises. Derivatives of all three germ layers are seen.

Choriostoma: A mass formed by maldevelopment of tissue, of a type not native to that site.

Heteroplasia: Development of cytologic and histologic elements not native to the part. Metaplasia: Change in tissue type after its full differentiation normally

Classification of Non Odontogenic Tumours Epithelial Benign Papilloma Squamous Acanthoma Keratoacanthoma Pigmented Cell Nevus Premalignant Leukoplakia Leukoedema Intraepithelial Carcinoma or Carcinoma in situ Erythroplakia Oral Sub Mucous Fibrosis Malignant Basal Cell Carcinoma Epidermoid carcinoma or Squamous cell carcinoma Verrucous Carcinoma Spindle Cell Carcinoma Adenoid Squamous cell Carcinoma Lmphoepithelioma and Transitional cell carcinoma Malignant Melanoma

Classification of Non Odontogenic Tumours.. Connective Tissue Benign Fibroma Giant Cell Fibroma Peripheral Ossifying Fibroma Central Ossifying Fibroma Peripheral Giant cell Granuloma Central GCG Aneursmal Bone Cyst Myxoma Malignant Fibrosarcoma Adipose tissue Benign Lipoma Verruciform Xanthoma Liposarcoma

Classification of Non Odontogenic Tumours… Vascular Tissue Benign Hemangioma Hereditary Haemorrhagic Talengiectasia Encephalo-trigeminal Angiomatosis Nasopharyngeal Angiofibroma Lmphangioma Malignant Haemangioendothelioma Haemangiopericytoma Kaposi’s Sarcoma Cartilage tissue Benign Chondroma Benign Chondroblastoma Chondromyxoid Fibroma Chondrosarcoma

Classification of Non Odontogenic Tumours… Bone tissue Benign Osteoma Osteoid Osteoma Benign Osteoblastoma Malignant Osteosarcoma Muscle tissue Leiomyoma Angiomyoma Rhabdomyoma Leiomosarcoma Rhabdomyosarcoma Lymphoid Tissue Malignant Malignant Lymphoma Non-Hodgkin’s Lymphoma Reticular Cell Sarcoma Burkitt’s Lymphoma Hodgkin’s Disease Leukaemias Ewings Sarcoma Plasma Cell Tumours Multiple Myeloma Plasmacytoma

Classification of Non Odontogenic Tumours… Nerve Tissue Benign Neurofibroma Neurolemmoma Malignant Malignant Schannoma Tumour Like Lesions Peripheral Giant Cell Granuloma CGCG Exostoses Pyogenic Granuloma Anurysmal Bone Cyst Traumatic Neuroma Tumours of Disputed Origin Granular Cell Myoblastoma Congenital Epulis Alveolar Soft Part Sarcoma Melanotic Neuroectodermal tumour of infancy Kaposi’s Sarcoma Ewing’s Sarcoma