Feasibility of immediate assessment of fine needle aspirates of thyroid nodules by telecytopathology

Abstract

Objective: In this study we discuss the diagnostic accuracy and unsatisfactory rate of onsite evaluation of ultrasound-guided fine needle aspiration (USGFNA) of thyroid nodules using telecytopathology and compare it to that of a control group without telecytopathology.

Methods: This was a retrospective analysis of USGFNA of thyroid nodules over a 9-month period with and without telecytopathology. There was no randomization for selection of the groups with and without telepathologist. A single provider performed all the procedures. Real-time images of Diff Quik-stained cytology smears were obtained with an Olympus Digital camera attached to an Olympus CX41 microscope and transmitted via the Internet by a cytotechnologist to a pathologist, who communicated the preliminary diagnosis and sample adequacy. The unsatisfactory specimen rate was compared between a group whose images were transmitted (n = 45) and another group without onsite adequacy assessment (nontransmitted) (n = 47).

Results: A total of 92 nodules in 67 patients were aspirated with ultrasound guidance. The unsatisfactory sample rate in the transmitted group was 13% (6 out of 45) and that of the non-transmitted group was 23% (11 out of 47). In the transmitted group, the cytology specimens of 3 patients that were initially deemed inadequate by the pathologist were considered adequate after 2 additional passes. In the transmitted group, preliminary diagnosis concurred with the final diagnosis in 96% of cases. Four passes were made in the non-transmitted group, versus 2 passes in the transmitted group.

Conclusion: Immediate assessment of USGFNA via telecytopathology assures adequacy of the cytology sample and may reduce number of passes per nodule. Preliminary onsite telecytopathology diagnosis was highly accurate when compared to final diagnosis.