Abstract
We describe the cytologic features of clear cell sarcoma of soft tissue (CCS) in 11 fine-needle aspiration biopsy (FNAB) specimens and 6 exfoliative specimens from 11 patients. In 3 patients, FNAB was the initial method of tumor evaluation. In 6 of 11 cases, immunostaining with S-100 or HMB-45 was evaluated. Electron microscopic evaluation was performed in 1 case. Both the FNAB and exfoliative specimens varied in overall cellularity, although reproducible cytologic features were identified. A significant diagnostic pitfall, namely the potential of CCS to form microacinar structures mimicking adenocarcinoma, is described with particular reference to CCS metastatic to regional lymph nodes. A rare case of the granular cell variant of CCS is illustrated as well. Owing to the rarity of CCS, the diagnosis on cytologic smears is extremely difficult and is aided substantially by pertinent clinical data. The diagnosis can be made conclusively by
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