case_images: PMC3420451_01
case_images: Auxiliary examinations including (a) myringoscope which showed a flesh-colored mass in the anterior and inferior walls of deep right external auditory canal, near the tympanic membrane. (b) Axial cranial CT which presented a well-circumscribed soft tissue mass with homogeneous density (white arrow) in the right external auditory canal.
case_images: CRIM.OTOLARYNGOLOGY2012-941065.001.jpg
case_images: PMC3420451_01_CRIM.OTOLARYNGOLOGY2012-941065.001.jpg
case_images: fig1
case_images: Myringoscope revealed a mass in the deep right auditory canal near the tympanic membrane (Figure 1(a)). CT scan revealed a well-circumscribed, slightly enhanced solid mass in the inferior wall of the right external auditory canal without bony erosion (Figure 1(b)).
case_images: Pathological examination revealed (a) irregular cell trabeculae or clusters lying in lamina propria, without involving the epidermic layer (HE stain x100); (b) tumor cells which had a moderately differentiated appearance, containing pleomorphic nuclei with increased mitotic activity (HE stain x400).
case_images: CRIM.OTOLARYNGOLOGY2012-941065.002.jpg
case_images: PMC3420451_01_CRIM.OTOLARYNGOLOGY2012-941065.002.jpg
case_images: fig2
case_images: The cuticular layer was not involved (Figures 2(a) and 2(b)).
case_images: The tumor cells were strongly positive for cytokeratin (CK stain x100).
case_images: CRIM.OTOLARYNGOLOGY2012-941065.003.jpg
case_images: PMC3420451_01_CRIM.OTOLARYNGOLOGY2012-941065.003.jpg
case_images: fig3
case_images: The result revealed strongly positive for CK and NSE (Figures 3 and 4) and moderate positive for vimentin, showing a pattern consistent with a neuroendocrine tumor.
case_images: The tumor cells were strongly positive for NSE (NSE stain x100).
case_images: CRIM.OTOLARYNGOLOGY2012-941065.004.jpg
case_images: PMC3420451_01_CRIM.OTOLARYNGOLOGY2012-941065.004.jpg
case_images: fig4
case_images: The result revealed strongly positive for CK and NSE (Figures 3 and 4) and moderate positive for vimentin, showing a pattern consistent with a neuroendocrine tumor.