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duct-, ducto-

[L. ductus, fr. ducere, to lead] Prefixes meaning to lead, carry, or convey.

ductal carcinoma in situ of breast

ABBR: DCIS. A cluster of malignant cells in the mammary ducts that has not spread to surrounding breast tissue. It is the most common noninvasive breast cancer and accounts for 25% of all breast cancer diagnoses. If left untreated, as many as 50% of patients with DCIS will develop invasive cancer. Because these cells grow in the ducts, they develop without forming a palpable mass. In its early stage this condition can be diagnosed through the use of mammography.

 TREATMENT: Lumpectomy is the most common treatment, followed by radiation. Mastectomy may be recommended if multiple areas are found or if there is a strong family history of breast cancer. SYN: comedocarcinoma. SEE: breast cancer; mammography.


(dŭk′tĭl) [L. ductilis, fr. ducere, to lead] Capable of being elongated without breaking.


(dŭk′shŭn) In ophthalmology, the rotation of an eye about an axis. This movement is controlled by the action of the extraocular muscles.


Having no duct; secreting only into capillaries.


(dŭk′tō-grăm) Injection of radiographic contrast into a duct of the breast, to determine the cause of nipple discharge.

duct tape occlusion therapy

ABBR: DTOT. Covering a wart (verruca vulgaris) with adhesive tape for six days; followed by soaking the lesion and then debriding it with emery or pumice; and then covering it again for six more days. It is a treatment used to remove warts that is as effective if not more effective than cryotherapy with liquid nitrogen.


(dŭk′tūl″) A very small duct.


(dŭk′tūs) pl. ductus [L. ductus, a channel] A duct. SEE: duct.

d. arteriosus In the fetus, a blood vessel connecting the main pulmonary artery and the aortic arch. In the fetal circulation, it permits most of the blood to bypass the fetal lungs. Normally, the ductus arteriosus closes soon after birth. SYN: Botallo duct.

d. choledochus 1. Bile duct. 2. Common bile duct.

d. deferens Vas deferens.

patent d. arteriosus Persistence after birth of a communication between the main pulmonary artery and the aorta. This condition in preterm infants has been treated successfully with surgery to close the duct and with nonsteroidal anti-inflammatory medications, such as ibuprofen or indomethacin, that inhibit synthesis of prostaglandin. SEE: prostaglandin.

d. venosus The smaller, shorter, and posterior of two branches into which the umbilical vein divides after entering the abdomen ...

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