case_images: PMC3686065_01
case_images: CT findings. The left sphenoid sinus shows a soft tissue shadow without bone damage.
case_images: CRIM.OTOLARYNGOLOGY2013-613472.001.jpg
case_images: PMC3686065_01_CRIM.OTOLARYNGOLOGY2013-613472.001.jpg
case_images: fig1
case_images: Although a soft tissue shadow was observed in the left sphenoid sinus, no damage to the surrounding bone tissue was evident (Figure 1).
case_images: CT findings. In both the left and right sphenoid sinuses, soft tissue shadows accompanying skull base damage are apparent.
case_images: CRIM.OTOLARYNGOLOGY2013-613472.002.jpg
case_images: PMC3686065_01_CRIM.OTOLARYNGOLOGY2013-613472.002.jpg
case_images: fig2
case_images: CT showed soft tissue shadows in both sphenoid sinuses and the left posterior ethmoid sinus, accompanying skull base damage (Figure 2).
case_images: Pathological findings. Amorphous medullary proliferation of medium-sized circular atypical cells is apparent. Nuclei are deeply stained, many are eccentrically located, cytoplasm is lightly eosinophilic, and some cells show brown pigment in parts.
case_images: CRIM.OTOLARYNGOLOGY2013-613472.003.jpg
case_images: PMC3686065_01_CRIM.OTOLARYNGOLOGY2013-613472.003.jpg
case_images: fig3
case_images: On the basis of these findings, malignant melanoma was diagnosed (Figure 3).