Tumors of Epithelial Tissue

Classification Stratified squamous epithelium Transitional epithelium Columnar glandular epithelium

Benign Malignant

Benign Tumor Papenoma Adenoma Polyp

AdenomaLocations Mucosa (stomach, small intestine and

bowel) Glands (endocrine and exocrine) Ducts Renal (small, asymptomatic)

AdenomaMorphological variants of

adenomas: Acinous (alveolar) Tubular Cystadenomas (appendix) Villiferous adenoma Fibroadenoma (breast adenoma)

Polyp A mass that projects above a mucosal

surface, as in the gut, to form a macroscopically visible structure

Glandular cuboidal or columnar epithelium

Types Aural (outside ear canal) Nasal (chronic sinus

infections, allergies, asthma) Colon Cervical (grows on the part of the

uterus that connects to the vagina) Uterine

Papilloma Transitional, squamous skin, larynx, urinary bladder,

kidney, esophagus etc grows exophytically (outwardly

projecting)

Oral cavity papilloma

Malignant epithelial neoplasm

Squamous Cell Carcinoma Adenocarcinoma Medular carcinoma Small cell carcinoma Large cell carcinoma Carcinoma in situ Mucinous Solidus Scirros

Carcinoma in situ a group of abnormal cells Examples: cervical, ducts in breast,

prostate, Bowen’s disease, bronchiolalevolar

Mesenchymal neoplasia abnormal cellular growth in bone,

connective tissue, or the lymph and circulatory systems.

benign or malignant

CONNECTIVE TISSUE NEOPLASMS

Smooth muscle: LeiomyosarcomaBone: OsteosarcomaFibrous tissue: FibrosarcomaCartilage: ChondrosarcomaFat: LiposarcomaNerve: NeurofibrosarcomaNerve sheath: NeurilemmosarcomaGlial cells: Malignant glioma

Fibroma Benign tumors that are composed of

fibrous Types: hard, soft They usually emerge in the cheeks,

tongue, palate and gums. Fibroids usually grow very slowly

Lipoma Benign neoplasm composed of fat Types: yellow fat, brown fat Soft to the touch, usually movable, and

are generally painless. Small (<1 cm) but can enlarge (6cm<)