The differential diagnosis of a mass lesion within the external auditory canal
can be quite extensive.
External auditory canal
cholesteatoma with erosion into the mastoid.
At our office, otoscopy revealed the presence of a nodular mass that had engaged the anterior aspect of the left cartilaginous portion of the external auditory canal
T cell non-Hodgkin's lymphoma of the external auditory canal
[in Spanish], Acta Otorrinolaringol Esp 2008;59(4):200-1.
The formation of sinus in congenital stenosis of external auditory canal
A longitudinal fracture through the external auditory canal
, middle ear and mastoid bone was present.
The remaining material is organized by anatomy, with seven chapters focusing on the external auditory canal
and pinna; the middle ear and mastoid; temporal bone vascular anatomy, anomalies, and disease, with an emphasis on pulsatile tinnitus; the inner ear and otodystrophics; temporal bone trauma; anatomy and development of the facial nerve; and the vestibulocochlear nerve, with an emphasis on the normal and diseased internal auditory canal and cerebellopontine angle.
Following are sections on surgery of the pinna and the external auditory canal
, middle ear, mastoid, and inner ear; brainstem implants; fistulae; and tumors and intracranial lesions.
At this time a repeat CT scan showed extensive abnormality of the left temporal bone and opacification of the left middle ear, external auditory canal
and mastoid air cells.
Tympanic membrane perforations can be caused by many different factors including infection, penetrating trauma by foreign bodies or surgical instruments inserted into the external auditory canal
or blunt or blast trauma.
Examination of the left ear revealed a large, epithelialized granulation tissue polyp on the posteroinferior aspect of the cartilaginous external auditory canal
(EAC) with some keratin trapping medial to it (figure 1).
CORTISPORIN(R) TC is indicated for the treatment of superficial bacterial infections of the external auditory canal