Halo sign | definition of halo sign by Medical dictionary
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Related to halo sign: Reversed Halo Sign
elevation of the subcutaneous fat layer over the fetal skull in a dead or dying fetus; said to be the most common radiologic sign of fetal death.
Etymology: Gk, halos, circular floor; L, signum, mark
A vague radiolucency imparted by the dense fibrous capsule of an ovarian dermoid cyst—mature teratoma, separating different sharply circumscribed tissue densities, often recognised by plain films of the lower abdomen
a halo effect produced in the radiograph of the fetal head between the subcutaneous fat and the cranium. It is said to be indicative of intrauterine death of the fetus.
ha·lo sign (hā'lō sīn)
Elevation of the subcutaneous fat layer over the fetal skull in a dead or dying fetus; said to be the most common radiologic sign of fetal death.
References in periodicals archive
5), and/or thoracic MDCT findings suggesting IPA (pulmonary nodule irrespective of the halo sign
, air crescent sign, or cavitation) supported by mycological evidence of molds (presence of fungal elements indicating molds in sputum/bronchoalveolar lavage fluid or positive culture for molds) were treated with antifungal agents.
conducted a study in 2003 evaluating the presence and frequency of the fat halo sign
in patients undergoing abdominal CT for clinical indications unrelated to the gastrointestinal tract.
It is considered a classic sign of inflammatory bowel disease, and a review suggests that the halo sign
is present only in a minority of bowel malignancies, said Dr.
The fat halo sign
is now known to occur only in patients whose mass exceeds 120 kg.