Fine-needle aspiration cytology of an adult rhabdomyoma of the head and neck

The cytologic features of a multifocal adult rhabdomyoma of the head and neck, as observed in a fine-needle aspiration specimen, are described. Cross-striations and characteristic cytoplasmic “crystals” were conspicuous in the cytologic preparations and also during ultrastructural examination. The cytologic features of adult rhabdomyoma are distinctive, allowing a rapid specific diagnosis.