Results: All smears showed similar features of abundant proteinaceous background, moderate cellularity including macrophages and irregular and variable sized groups of cells with slightly enlarged round hypercromatic nuclei and abundant bluish vacuolated cytoplasm frequently containing small reddish granulations. The first FNAB reports confirmed salivary origin and the second ones alert for possible neoplastic nature, advising surgical resection. Electron microscopy performed in the parotid case caracterized the granules as mucigen. Subsquent pathologic evaluation and molecular confirmation was carried out. Conclusion: MASC is a low grade malignant tumor capable of simulating a benign salivary gland process so it is important to know its cytological characteristics.