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17 Cards in this Set
- Front
- Back
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what is thyroiglossal duct
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a tubular structure through which the thyroid gland migrates...
begins at foramen cecum (at tongue basE) , extends anterior to the thyrohyoid membrane and strap muscles, and ends at level of thyroid isthmus |
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when does thyroglossal duct normally involute
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8-10 weeks gestation
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pathophys of thryoglossal duct cyst
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if any portion of the thryoglossal duct fails to involute, a cyst or sinus tract can form (b/c duct is lined by secretory epithelium)
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are the majority of thyroglossal duct cysts midline or off midline
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75% are midline,
most are at or below hyoid bone |
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most common midline neck mass
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thyroglossal duct cyst
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appearance of thyroglossal duct cyst
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cystic mass with thin peripheral rim of capsular enhancement
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pathophys of laryngocele
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develops from increased laryngeal pressure (glass blowers, musicians)
abnormal dilatation of ht appendix of the laryngeal ventricle (separating the false and true cords) |
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describe location of laryngocele
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they are both in and outside of thyrohyoid membrane most commonly (although they can be either above or below)
usually present as a lateral neck mass near hyoid bone |
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what should the formation of a laryngocele in absence of risk factors suggest
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a neoplasm obstructing the laryngeal ventricle
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which branchial cleft do most of the branchial cleft cysts arise from
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2nd
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how many branchial clefts are there
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6
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course of 2nd branchial cleft
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begins at base of tonsillar fossa dn extends between internal and external carotid arteries
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most common location of a 2nd branchial cleft cyst
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usually anterior to the middle portion fSCM
lateral to internal jugular vein at level of carotid bifurcation |
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types of lymphangiomas
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capiilary
cavernous cystic |
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how does the lymphatic system develop
how does lymphangioma develop |
from primitive embryonic lymph sacs that are derived from venous system
if the lymph sacs fail to communicate with venous system, then lymph sacs dilate with lymph --> lymphangioma if a single region fails to communicate--> cystic hygroma extensive lack of communication --> fetal hydrops |
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medical conditions assoc with cystic hygroma
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turner syndrome
fetal alcohol syndrome noonan sydrome |
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medical conditions assoc with cystic hygroma
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turner syndrome
fetal alcohol syndrome noonan sydrome |
