Figure 1

Imprint cytology of lesion showing cohesive clusters of neoplastic cells with abundant and finely granular cytoplasm and moderately pleomorphic nuclei located centrally or peripherally (a: haematoxylin- eosin, × 400). Permanent sections revealed a neoplasm that had invaded subcutaneous adipose tissue (b: haematoxylin- eosin, × 100) and perineural tissue (c: haematoxylin-eosin, × 200). Neoplastic elements with abundant granular eosinophilic cytoplasm, large nuclei and evident nucleoli, are large, round or polyhedral cells arranged in solid sheets, islands and cords (d: haematoxylin-eosin, × 400).