Down Syndrome with "Cupped pinna" deformity description
Some landmarks not visible. No horizontal line from tragus up to furthest part of the antihelix. Common with Down Syndrome
excessive development of an organ or part. Specifically: increase in bulk (as by thickening of muscle fibers) without multiplication of parts
Microtia definition and related information
Microtia: malformed pinna, partially developed Symptoms: Decreased localization Comorbid factors: Atresia: absent opening, often occurs with Microtia Can put a TDH over that to determine size of ABG with atresia.
Stenosis definition and related information
Stenosis: abnormally small opening, any narrowing of ear canal, often CHL if complete closure. May come on later in life, with a disorder, or can be there at birth. Really bad infections can cause skin to swell shut (painful).
Testing challenges related to Stenosis
Canal collapse: insert phones or use of tubing/specula Increased SPL in EAC can lead to TTS
Complete absence of pinna / EAC Incidence: 1 in 10,000-20,000 Unilateral 3-5x more common than Bilateral Males > Females Right > Left Inheritance—sporadic, Autosomal recessive or dominant