Exam 2 Flashcards
torticollis
inability to completely turn the head in both directions
Causes of Microcephaly
- Genetic defect
- Karyotype
- Intrauterine infections
- Antenatal radiation
- Exposure to drugs/chemicals
- Perinatal insult
Causes of Scaphocephaly (aka Dolichocephaly)
- positional problems int he premature infant (“Premie head”)
- Saggital craniosynostosis
Causes of Plagiocephaly
- Common with back head sleep position
- Torticollis
Scaphocephaly
- Growth is parallel to sagittal suture (anteroposterior elongation, bitemporal narrowing)
- Frontal bossing and prominent occiput
Bracycephaly
- Bilateral coronal or lambdoidal (11%)
- Broad skull with a short base and a recessed lower forehead
- Caused by premature closure of the coronal suture on both sides of the head (associated with Apert, Crouzon, Pfeiffer syndrome)
- “high-hat” appearance (compared to the long narrow appearance of sagittal craniosynostosis
Crouzon’s syndrome
- Craniosynostosis most often of the coronal and lambdoid, and occasionally sagittal sutures (brachycephalic)
- Underdeveloped midface with receded cheekbones (midface hypoplasia) or exophthalmos (bulging eyes)
- Esotropia and/or wide-set eyes
- Hypertelorism
- Need to open up these sutures early to allow their brain to grow
Apert Syndrome
- Very high brachycephalic head
- Severe syndactyly affecting all limbs (“mitten-hand appearance”); syndactyly involves bony fusion
- Hypertelorism, ptosis, downward-slanting palpebral fissures
- Cognitive defects
- Apert is the 2nd most common craniofacial syndrome after Crouzon.
Metopic Craniosynostosis
- “Trigonocephaly”
- Keel-shaped forehead with hypotelorism
- Upward slanting of the eyelids laterally
- Triangular shape to the forehead and supraorbital ridge
- They get ocular problems (astigmatism & strabismus). It’s not urgent though; it won’t affect their brain growth.
- You’d feel overriding sutures at the forehead tip
Oxycephaly
- Closure of all sutures except squamosal
- This is an EMERGENCY; she needs urgent surgery done to open up her suture line and allow her brain to grow
Positional plagiocephaly
- “Parallelogram” shape
- Face will be pushed forward on the affected side
- Frontal bossing due to pressure on the occiput
- The ear on the affected side will be forward i comparison to the unaffected side
- Commonly associated with torticollis, or positional problems (not changing the baby’s position often enough)
Lambdoidal craniosynostosis
- “Trapezoid” shape
- Affected side no open suture; if there is lambdoidal synostosis, the head cannot expand in the frontal region on the affected side of the head so the growth will be affected on the unaffected side
- Since there is growth restriction on the affected side, there is overgrowth everywhere else
- The face is asymmetrical; one side of the face is coming out more than the other
- Posterior displacement of the ipsilateral ear
Waardenburg syndrome
- White forelock
- Beaked nose
- Triangular face, pointed chin
- *They develop hearing loss later in life; it’s a genetic disease with variable penetrance, so the amount of hearing loss varies from person-to-person
Alopecia areata
- Autoimmune disease
- Black dot sign
- Circular pattern of hair loss
Midface hypoplasia
- associated with sleep apnea and stridor
- dental problems
- may have hearing problems
Micrognathia
- The mandible has not grown as much as it should resulting in a small mandible and chin.
- Advancement of the mandible and chin surgically
- The correction is done via the intraoral route without any incisions on the face
- preceded by orthodontic treatment to align the teeth prior to proper surgical treatment
Prognathic mandible
- Lower jaw is too prominent
- Occurs with congenital overgrowth of the lower jaw
- Certain pathologic causes such as gigantism due to pituitary overgrowth and other tumors or congenital deformities
Sturge Weber Syndrome
- Look for non-elevated purple venous malformation (port wine stain) in the distribution of trigeminal nerve (i.e. forehead and upper eyelid)
- Involves opthalmic division
- High incidence of mental retardation
- Ocular complications (glaucoma) on the affected side
- High incidence of seizures related to deformation of the brain
- Today they can laser away the redness; you’d never know there was anything wrong.
Myopia
“Nearsightedness”
- Occurs when the anterior-posterior diameter of the eye is too long relative to the refracting power of the cornea and lens
- Lengthening of the eye in such a way is common at the start of puberty; hence why a lot of people start wearing glasses in middle school
Hyperopia
“Farsightedness”
- Hyperopic eye is too short relative to the refracting power of the eye
- The focal point of the image occurs posterior to the retina and the image that forms on the retina is blurred
- Glasses may not be requried
Astigmatism
- Type of refractive error that causes blurred vision for objects at both distance and near
- Occurs because the optical system of the eye, particularly the cornea, is not perfectly spherical
Strabismus
Occurs when the eyes do not move in synchronous pattern
Esotropia
(type of strabismus)
- (Convergent squint) inward deviation
Exotropia
(type of strabismus)
- (Divergent squint) outward deviation
Latent Strabismus
“PHORIA”
- Becomes apparent only on dissociation of the vision of the eyes (e.g. on covering one eye) and is termed a phoria (exophoria, esophoria, hyperphoria)
- Can be more prominent with fatigue, illness, or with lack of attention
Hypertropia
(type of strabismus)
- condition of misalignment of the eyes (strabismus) whereby the visual axis of one eye is higher than the fellow fixating eye
Hypotropia
(type of strabismus)
- condition where the visual axis of one eye is lower than the fellow fixating eye
Esophoria
Characterized by tendency toward inward deviation of the eye usually due to extraocular muscle imbalance with good fusion
Exophoria
Form of heterophoria in which there is a tendency of the eye to deviate outward
Comitant strabismus
- Same deviation in all fields of gaze
- Causes include: Hereditary, Sensory deprivation, Accommodative (kids with frequent excessesive convergence aka esotropia), sometimes unknown cause
Incomitant strabismus
- Limited eye movement and size of deviation is different in different fields of gaze
- Occurs most commonly where there is paralysis of one or more extraocular muscles
- Causes include: Neurological, Muscular, Neuromuscular (myasthenia gravis), Congenital conditions
Tests for Strabismus
- Hirschberg test (Corneal light reflex)
- Red reflex (Bruckner test)
- Cover test
- Evaluate extraocular movement
- Binocular status; Stereopsis Tests
Amblyopia
- Poor vision caused by abnormal visual development secondary to abnormal visual stimulation
- Classified by the presence of associated clinical findings:
(1) Strabismic amblyopia
(2) Anisometropic or refractive amblyopia
(3) Deprivational amblyopia
Strabismic amblyopia
- Results from abnormal binocular interaction
- Causes the fovea of the two eyes to be presented with different images
- This is preventable!
Anisometropic amblyopia
- Similar to strabismic amblyopia, the fovea in the anisometropic amblyopia also are presented with different images
- Caused by unequal refractive error
- When you have a 2 line difference below age 8, you will eventually turn off the eye that is the poorer eye
- Picked up with red light reflex assessment