Cystic hygroma is an uncommon lymphatic tumor seen rarely in adults, with less than 100 cases reported in the literature. The etiology and pathophysiology of this lesion is still in question. The majority of cystic hygromas occur in the head and neck, particularly in the posterior triangle. Although cystic hygromas tend to enlarge progressively over a span of weeks or months, relatively rapid enlargement over a span of days has been described. We present the unique case of an adult woman who experienced sudden onset of a large cystic hygroma in the neck without history of antecedent swelling, infection, or trauma. Successful surgical removal of the hygroma was performed. A brief review of the literature is presented.
"Most are seen in the head and neck region (75–80%) and usually affect children under 2 years of age . They are quite rare in adults . The etiology of hygromas in adults is controversial, but they are thought to be due to proliferation of lymphoid vessels in response to head and neck trauma and/or infection . "
[Show abstract][Hide abstract] ABSTRACT: Cystic hygromas/lymphangiomas are extremely rare malformations in adults. They are usually seen in infants and children under 2 years of age. En bloc resection is difficult due to the adhesive characteristics of the tumors. Inadequate surgical intervention often leads to recurrent disease. We report herein the case of a cystic hygroma/lymphangioma that presented as an uncommon mass on the cervical region in an adult, together with its histopathological, radiologic, and operative features.
"Usually cystic hygromas are diagnosed clinically with large size, location and translucence. Although cystic hygromas tend to enlarge progressively over months a relatively rapid increase in size has also been described . Cystic hygromas may be associated with Turner syndrome, Noonan syndrome, trisomies, fetal alcohol syndrome, chromosomal aneuploidy, cardiac anomalies and fetal hydrops . "
[Show abstract][Hide abstract] ABSTRACT: Cervical cystic hygroma is a benign congenital malformation of the lymphatic system. Incidence of cystic hygroma is 1/6000 live births. We present a case of right neck mass with potential respiratory compromise in a newborn.
The patient was a full term baby girl with an incidental finding of right neck mass which was described on ultrasound and magnetic resonance imaging as a cystic lesion in the nasopharynx and right neck which inferiorly followed the course of the right carotid artery, consistent with cystic hygroma. She started with respiratory compromise, and a follow-up magnetic resonance imaging showed increased size of the cystic hygroma. Dexamethasone was started to reduce fluid build up in the mass. When the cystic hygroma was found to be inseparable from the right half of the thyroid gland, the otolaryngologist performed hemithyroidectomy.
The patient had neuropraxia involving the marginal mandibular branch of the facial nerve, which was expected to correct with time. Large cervical cystic hygromas may surround or displace neurovascular structures making their identification quite challenging intraoperatively. A team of experienced surgeons will help to ensure a successful surgical outcome.
[Show abstract][Hide abstract] ABSTRACT: Analyzes the characteristics of rarefied, nonequilibrium-state
plasmas in the internal column of a hollow cathode discharge (HCD). The
analysis is based on the theory of plasma disintegration in a strong
electric field (Dreicer 1959, 1960). It is demonstrated that this
process has a crucial influence upon the forming of directed flux of
electrons with energy values 20-30 eV at the exit of the hollow cathode.
The obtained values significantly exceed the energy of thermal motion of
electrons in the plasma disintegration zone. A new method is suggested
of calculating electron density and electric field intensity in respect
to the axis of the internal column in the channel model of the
discharge. In addition, a method is presented of calculating the length
of the internal column and the energy of the directed electron flux at
the exit of the hollow cathode on the basis of HCD fundamental
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