Category: V
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Vulvar hematoma
Extravasation of blood into the soft tissues of the external female genitalia. The bleeding may occur after childbirth or as a result of trauma (e.g., rape trauma). Postpartum bleeding usually is due to the shearing of submucosal tissues during a difficult or forceps-assisted delivery.
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Visual hallucination
The sensation of seeing objects that are not really there. This is a hallmark of alcohol and drug withdrawal and of other medical illnesses that adversely affect the brain.
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Vascular goiter
A goiter due to distention of the blood vessels of the thyroid gland.
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Vaginal gland
Acinous glands found in the uppermost portion of the vaginal mucosa near the cervix, most of the vaginal mucosa being devoid of glands.
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Viral gastroenteritis
Gastroenteritis caused by ingested viruses. The median incubation period is 24 to 48 hr and the median duration of the symptoms is 12 to 60 hr. Most patients will experience diarrhea, nausea, abdominal cramps, and vomiting and many become dehydrated. There is no specific treatment other than supportive therapy and fluid replacement.
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Vomiting gas
A gas, particularly chloropicrin, that induces vomiting.
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Vesicant gas
A type of gas that blisters the skin. Clothing and boots become contaminated and a source of danger. Mustard and lewisite gases are examples.
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Vestibular ganglion
A bilobed ganglion on the vestibular branch of the acoustic nerve at the base of the internal acoustic meatus. Its peripheral fibers begin in the maculae of the utricle and saccule and in the cristae of the ampullae of the semicircular ducts.
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Volume fraction
The ratio of the volume of a constituent to the volume of the whole. In practice, it may be difficult to determine the volume fraction because differences in the molecular sizes of the constituents may produce a total volume that differs from the sum of the individual volumes of the mixture. When materials of similar…
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Vena cava foramen
The opening in the diaphragm through which the inferior vena cava and branches of the right vagus nerve pass.