RT Book, Section
A1 Jauch, Edward C.
A1 Hall, Gregory
A1 Knoop, Kevin J.
A2 Knoop, Kevin J.
A2 Stack, Lawrence B.
A2 Storrow, Alan B.
A2 Thurman, R. Jason
SR Print(0)
ID 1181040015
T1 Exostosis
T2 The Atlas of Emergency Medicine, 5e
YR 2021
FD 2021
PB McGraw-Hill
PP New York, NY
SN 9781260134940
LK accessmedicine.mhmedical.com/content.aspx?aid=1181040015
RD 2024/04/20
AB Exostoses  are  seen  on  otoscopy  as  discreet  single  or  multiple  round  shiny  swellings  deep  in  the  bony  external  auditory  canal  (EAC).  They  are  usually  asymptomatic,  an  incidental  finding  on  exam,  and  extremely  slow  growing.  The  inferior  canal  walls  anteriorly  and  posteriorly  are  hypertrophied,  with  a  resultant  “V”  shape.  Rarely  they  enlarge  enough  to  occlude  the  EAC.  They  are  usually  bilateral  and  are  thought  to  develop  in  response  to  repeated  cold  water  exposure,  such  as  frequent  swimmer  or  divers.  Hearing  loss,  ear  infection,  pain,  and  tinnitus  may  arise  when  they  enlarge  sufficiently  to  interfere  with  the  normal  self-cleansing  of  cerumen  and  desquamated  keratin,  leading  to  external  otitis  or  conductive  hearing  loss  from  impacted  cerumen.