Cystic neck lesions Flashcards
floor of mouth cysts
rannula, dermoid/epidermoid, thyroglossal duct cyst, cystic mets
ranula
mucous retention cyst from sublingual gland that may plunge into submandibular space (protrudes over mylohyoid)
typically eccentric
dermoid/epidermoid
dermoid: teratomatous lesion
epidermoid: ectoderm
fluid attenuating lesions midline floor of the mouth
dermoid: sack of marbles from fat globules on MRI
thyroglossal duct cyst
persistent thryoglossal duct which follows embryonic thyroid gland from base of tongue (foramen cecum); elevates with tongue protrusion
midline, infrahyoid
rarely complicated with thryoid carcinoma (papillary)
cystic metastasis
papillary thyroid cancer or squamous cell carcinoma may be cystic and metastasize to floor of mouth
first brachial cleft cyst
rare; located near parotid or external auditory canal
may also become superinfected
second brachial cleft cyst
congenital anomaly arising from embryologic branchial apparatus; most common type
along path from palatine tonsil to supraclavicular region; typically near angle of mandible/anterior to SCM
may become superinfected
uncommon in older adults; intead think cystic mets
submandibular/masticator abscess
dental disease, suppurative adenopathy, spread of adjacent salivary gland infection
irregular thick walled peripherally enhancing fluid collection iferior to mandible; stranding of cervical fat
lymphatic malformations
cystic hygroma, cavernous lymphangioma, capillary lymphangioma
most common lymphatic malformation
cystic hygroma; seen at birth with chromosomal anomalies (Turner/Down); posterior triangle of neck
cavernous vs capillary lymphangioma
cavernous lymphangioma > capillary lymphangioma
thornwaldt cyst
notocordal remnant; may cause halitosis
midline nasopharynx
lingual thyroid
ectopic thyroid tissue at floor of mouth; usually only functioning thyroid tissue
more common in females; susceptible to thyroiditis/cancer
