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In medicine, an ectopia is a displacement or malposition of an organ or other body part. Most ectopias are congenital, but some may happen later in life. ==Examples== *Ectopic ACTH syndrome, also known as small-cell carcinoma, a virlulant lung cancer *Ectopic calcification, a pathologic deposition of calcium salts in tissues or bone growth in soft tissues *Cerebellar tonsillar ectopia, aka Chiari Malformation, a herniation of the brain through the foramen magnum, which may be congenital or caused by trauma. *Ectopic cilia, a hair growing where it isn't supposed to be, commonly an eyelash on an abnormal spot on the eyelid, distichia *Ectopia cordis, the displacement of the heart outside the body during fetal development *Ectopic enamel, a tooth abnormality, where enamel is found in an unusual location, such as at the root of a tooth *Ectopic expression, the expression of a gene in an abnormal place in an organism *Ectopic hormone, a hormone produced by a tumor, such as small-cell carcinoma, can cause Cushing's syndrome *Ectopia lentis, the displacement of the crystalline lens of the eye *Neuronal ectopia *Ectopic pancreas, displacement of pancreatic tissue in the body with no connection, anatomical or vascular, to the pancreas *Ectopic recombination, the recombination between sequences (like leu2 sequences) present at different genomic locations *Renal ectopia occurs when both kidneys are on the same side of the body *Ectopic testis, a testis that has moved to an unusual location *Ectopic thymus, where thymus tissue is found in an abnormal location *Ectopic thyroid, where an entire or parts of the thyroid are located elsewhere in the body *Ectopic tooth *Ectopic ureter, where the ureter terminates somewhere other than the urinary bladder *Ectopia vesicae, a congenital anomality in which part of the urinary bladder is present outside the body 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ectopia (medicine)」の詳細全文を読む スポンサード リンク
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