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  • Title: The value of touch imprint cytology in EUS-guided Trucut biopsy.
    Author: Vanderheyden AD, Proctor KA, Rizk MK, Silva RG, Jensen CS, Gerke H.
    Journal: Gastrointest Endosc; 2008 Jul; 68(1):44-50. PubMed ID: 18355821.
    Abstract:
    BACKGROUND: EUS-guided Trucut biopsy (TCB) enables the acquisition of tissue cores for histologic assessment. Touch imprint cytology (TIC) can be performed at the time of a biopsy to assess the adequacy of the sample; however, limited information is available on the diagnostic value of TIC of these specimens. OBJECTIVE: To investigate the diagnostic accuracy of TIC compared with a TCB. PATIENTS AND DESIGN: Consecutive EUS-guided TCB and TIC (n = 109) were retrospectively and independently reviewed by a surgical pathologist (for the TCB) and a cytopathologist (for TIC) blinded to the final diagnoses. SETTING: University of Iowa Hospitals and Clinics, Iowa. MAIN OUTCOME MEASUREMENTS: Diagnostic accuracy of a TCB, TIC, and combined TCB + TIC. RESULTS: The diagnostic accuracy of a TCB was 92.7% (95% CI, 83.1%-97.3%), TIC was 82.6% (95% CI, 74.3%-88.6%), and TCB + TIC was 95.4% (95% CI, of 89.4%-98.3%). The diagnostic accuracy of a TCB alone was superior to TIC alone (P = .038); a TCB was diagnostic in 14 cases that were nondiagnostic by TIC. The addition of TIC allowed for the identification of 3 malignancies (2.8%) that were not identified on TCB alone. In 22 cases, TIC was considered diagnostic, but a TCB provided additional specific diagnostic information. LIMITATIONS: Retrospective study and relatively low numbers. CONCLUSIONS: TIC is a valuable tool for use in a EUS-guided TCB; TIC is independently diagnostically accurate, which allows for confidence in a rapid preliminary diagnosis, and it provides additional diagnostic value when combined with TCB.
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