PMC3686065_01
CT findings. The left sphenoid sinus shows a soft tissue shadow without bone damage.
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Although a soft tissue shadow was observed in the left sphenoid sinus, no damage to the surrounding bone tissue was evident (Figure 1).
CT findings. In both the left and right sphenoid sinuses, soft tissue shadows accompanying skull base damage are apparent.
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CT showed soft tissue shadows in both sphenoid sinuses and the left posterior ethmoid sinus, accompanying skull base damage (Figure 2).
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.
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On the basis of these findings, malignant melanoma was diagnosed (Figure 3).