Rubin's 29: Head and Neck (gave up on this one ignore it) Flashcards Preview

MS2 Unit 3 > Rubin's 29: Head and Neck (gave up on this one ignore it) > Flashcards

Flashcards in Rubin's 29: Head and Neck (gave up on this one ignore it) Deck (19):
1

Crouzon Syndrome, Apert Syndrome

- autosomal dominant disorders
- associated with craniosynostosis (premature fusion of the cranial sutures)
- can lead to brachycephaly (flat head), scaphocephaly or dolichocephaly (the head is disproportionately long and narrow or “boat” shaped) or trigonocephaly (triangular shaped)
- FGFR2 mutation on chromosome 10

2

Kleeblattschädel deformity

- severe craniosynostosis leads to "cloverleaf" skull

3

FGFR2 gene

encodes a transmembrane protein that, upon binding its ligands, signals to induce bone maturation

4

Fordyce granules

aggregates of sebaceous glands in the oral cavity (choristoma)

5

ectopic thyroid

- Abnormal descent of the thyroid during development may create submucosal foci of ectopic thyroid between the tongue and suprasternal notch
- MC site: The base of the tongue between the foramen cecum and epiglottis--> lingual thyroid
- removal --> hypothyroid, cretinism
- malignancy: papillary thyroid carcinomas.
- may affect parathyroid gland development and localization.

6

Thyroglossal duct cysts

Result from persistence and cystic dilatation of the thyroglossal duct midline in the neck
- occurs above the thyroid isthmus but below the hyoid bone
- under age 40, nodule moves up and down upon swallowing.
- Surgery is the treatment of choice.
- papillary thyroid carcinomas in up to 1% of thyroglossal duct cysts.

7

Branchial cleft cyst

- originate from branchial arch remnants
- in the lateral anterior neck or parotid gland in young adults
- contain thin, watery fluid and mucoid or gelatinous material
- lined by squamous epithelium, with occasional foci of ciliated respiratory or pseudostratified columnar epithelium.

8

Scarlet fever

- caused by several strains of β-hemolytic streptococci (Streptococcus pyogenes)
- Damage to vascular endothelium by the erythrogenic toxin results in a rash on the skin and oral mucosa (strawberry tongue)
- Untreated scarlet fever can lead to glomerulonephritis and heart disease

9

Apthous stomatitis (canker sores)

- painful, recurrent, solitary or multiple, small ulcers of oral mucosa, unknown cause
- shallow ulcer covered by a fibrinopurulent exudate, with underlying mononuclear and polymorphonuclear inflammation
- heal without scarring

10

Acute necrotizing ulcerative gingivitis (Vincent angina)

- caused by infection with two symbiotic organisms, a fusiform bacillus and a spirochete (Borrelia vincentii)
- caused by inadequate nutrition, immunodeficiency or poor oral hygiene
- characterized by punched-out erosions of the interdental papillae. Tends to spread and eventually involves all gingival margins, which become covered by a necrotic pseudomembrane

11

Noma

- severe fusospirochetal infection in people who are malnourished, debilitated from infections or weakened by blood dyscrasias
- rapidly spreading gangrene of oral and facial tissues
- Large masses of tissue slough and leave the bones exposed, especially in children

12

Ludwig angina

- rapidly spreading cellulitis originating in the submaxillary or sublingual space but extending to involve both.
- potentially life-threatening inflammatory process
- uncommon in developed countries except in patients with chronic illnesses associated with immunosuppression.
- related to dental extraction or trauma to the floor of the mouth.

After extraction of a tooth, hairline fractures may occur in the lingual cortex of the mandible, providing microorganisms ready access to the submaxillary space.
- may dissect into the parapharyngeal space along fascial planes and from there into the carotid sheath.
- mycotic internal carotid artery aneurysm may result, erosion of which may cause massive hemorrhage.
- inflammation may also dissect into the superior mediastinum to involve the pleural space and pericardium.

13

diptheria

Corynebacterium diphtheriae
- patchy pseudomembrane, often begins on the tonsils and pharynx but may also involve the soft palate, gingiva or buccal mucosa

14

tuberculosis

- Primary tuberculosis of the oral mucosa is rare.
- lesions spread from the lung, with bacilli carried in sputum and entering small breaks in the mucosa. There, they produce irregular, painful ulcers, mostly on the tongue.
- Caseating granulomatous inflammation

15

syphilis

- Primary syphilitic chancres may form on the lips, tongue or oropharyngeal mucosa after contact with an infectious lesion
- Regional lymphadenitis follows and heals by itself in a few weeks
- diffuse mucocutaneous eruption of the secondary stage follows. Syphilitic lesions in the oral mucosa are multiple gray-white patches overlying ulcerated surfaces. May remit and also recur spontaneously.
- Gummas may appear years after initial infection as firm nodular masses that ulcerate and may cause palatal perforation

16

actinomycosis

- Actinomyces bovis or Actinomyces israelii
- produces chronic granulomatous inflammation and abscesses that drain by fistula formation, with suppurative infection containing characteristic yellow “sulfur granules.” - In cervicofacial actinomycosis, soft tissue infection may extend to adjacent bones, most often to the mandible.

17

Candidiasis

C. albicans
- To cause disease, the fungus must penetrate tissues, albeit superficially
- Oral candidiasis mostly seen in diabetics and people with compromised immune systems.
- Lesions are white, slightly elevated, soft patches that consist mainly of fungal hyphae.

18

HSV1

- Aerosol transmission
- painful inflammation of affected mucosa, followed shortly by formation of vesicles, resulting from “ballooning degeneration” of epithelial cells, some of which show intranuclear inclusions
- vesicles rupture to form shallow, painful, which heal spontaneously without scarring.
- it remains dormant in the trigeminal ganglion until stresses such as trauma, allergy, menstruation, pregnancy, UV light, and other viral infections reactivate it.

19

HPV

causes papillomas
“High-risk” HPV (16, 18, 31, 33, 35) strongly associated with oropharyngeal squamous cell carcinoma