Histopathology

Metaplasia (Greek: "change in form") is the reversible replacement of one differentiated cell type with another mature differentiated cell type.

Carcinoma in situ (CIS), also known as in situ neoplasm, is a group of abnormal cells.

Scars are areas of fibrous tissue (fibrosis) that replace normal skin after injury.

In situ pulmonary adenocarcinoma (AIS), previously called "Bronchioloalveolar carcinoma" (BAC), is a term describing certain variants of lung cancer arising in the distal bronchioles or alveoli that initially exhibit a specific non-invasive growth pattern.

Prostate cancer, also known as carcinoma of the prostate, is the development of cancer in the prostate, a gland in the male reproductive system.

Fatty liver, also known as fatty liver disease (FLD) or hepatic steatosis, is a reversible condition wherein large vacuoles of triglyceride fat accumulate in liver cells via the process of steatosis (i.e., abnormal retention of lipids within a cell).

Fibrosis is the formation of excess fibrous connective tissue in an organ or tissue in a reparative or reactive process.

Basal cell carcinoma (BCC) (also known as basalioma or basal cell cancer), is the most common skin cancer, and one of the most common cancers in the United States.

Not to be confused with Tautopathy, which is a controversial alternative medicine practice similar to Homeopathy.

In medicine, sclerosis (also spelled sclerosus in the names of a few disorders; from Greek σκληρός "hard") is the stiffening of a structure, usually caused by a replacement of the normal organ-specific tissue with connective tissue.

Tabes dorsalis, also known as syphilitic myelopathy, is a slow degeneration (specifically, demyelination) of the nerves primarily in the dorsal columns (posterior columns) of the spinal cord (the portion closest to the back of the body).

Kikuchi disease or Kikuchi-Fujimoto disease was described in 1972 in Japan.

Focal cortical dysplasia (FCD) is a congenital abnormality of brain development where the neurons in an area of the brain failed to migrate in the proper formation in utero.

Thrombotic microangiopathy, abbreviated TMA, is a pathology that results in thrombosis in capillaries and arterioles, due to an endothelial injury.

Eosinophilic gastroenteritis (EG) is a rare and heterogeneous condition characterized by patchy or diffuse eosinophilic infiltration of gastrointestinal (GI) tissue, first described by Kaijser in 1937.

A papilloma (plural papillomas or papillomata) (papillo- + -oma) is a benign epithelial tumor growing exophytically (outwardly projecting) in nipple-like and often finger-like fronds.

Renal osteodystrophy is currently defined as an alteration of bone morphology in patients with chronic kidney disease (CKD).

Steatosis (also called fatty change, fatty degeneration, or adipose degeneration) is the process describing the abnormal retention of lipids within a cell.

Astrogliosis (also known as astrocytosis or referred to as reactive astrocytosis) is an abnormal increase in the number of astrocytes due to the destruction of nearby neurons from CNS trauma, infection, ischemia, stroke, autoimmune responses, and neurodegenerative disease.

Nodular sclerosis (or "NSHL") is a form of Hodgkin's lymphoma that is the most common subtype of HL in developed countries.

Epithelial dysplasia, a term becoming increasingly referred to as intraepithelial neoplasia, is the sum of various disturbances of epithelial proliferation and differentiation as seen microscopically.

Acanthocyte (from the Greek word ἄκανθα acantha, meaning 'thorn'), in biology and medicine, refers to a form of red blood cell that has a spiked cell membrane, due to abnormal thorny projections.

Embryonal carcinoma is a relatively uncommon type of germ cell tumour that occurs in the ovaries and testes.

Desquamative interstitial pneumonia is a form of idiopathic interstitial pneumonia featuring elevated levels of macrophages.

A rheumatoid nodule is a local swelling or tissue lump, usually rather firm to touch, like an unripe fruit, which occurs almost exclusively in association with rheumatoid arthritis.

Subacute combined degeneration of spinal cord, also known as Lichtheim's disease, refers to degeneration of the posterior and lateral columns of the spinal cord as a result of vitamin B12 deficiency (most common), vitamin E deficiency, and copper deficiency.

For more information on this topic, see Nasopharyngeal carcinoma Lymphoepithelioma is a type of poorly differentiated nasopharyngeal carcinoma characterized by prominent infiltration of lymphocytes in the area involved by tumor.

In urologic pathology, high-grade prostatic intraepithelial neoplasia, abbreviated HGPIN, is an abnormality of prostatic glands and believed to precede the development of prostate adenocarcinoma (the most common form of prostate cancer).

In gastroenterology, a sessile serrated adenoma (abbreviated SSA), also known as sessile serrated polyp (abbreviated SSP), is a premalignant flat (or sessile) lesion of the colon, predominantly seen in the cecum and ascending colon.

Patched (Ptc) is a conserved 12-pass transmembrane protein receptor that plays an obligate negative regulatory role in the Hedgehog signaling pathway in insects and vertebrates.

Osteopenia is a condition in which bone mineral density is lower than normal.