[A comparison of Thinprep and conventional smears].

Area of Science:

• Cytopathology
• Surgical Pathology

Background:

• Conventional smear (CS) cytology is a widely used diagnostic technique.
• ThinPrep (TP) technology offers potential improvements in sample preparation for cytological analysis.

Purpose of the Study:

• To compare the efficacy of ThinPrep (TP) slides versus conventional smear (CS) slides in fine needle aspiration cytology.
• To evaluate differences in cell quality, cellularity, preservation, and nuclear architecture between TP and CS preparations across various sample types.

Main Methods:

• A total of 522 fine needle aspiration samples were analyzed.
• Parallel preparations of one TP slide and one CS slide were created for each sample.
• Slides were compared based on cell quality, cellularity, preservation, nuclear architecture, and background characteristics.

Main Results:

• TP slides showed superior cell quality in breast and metastatic cancer samples compared to CS.
• Cell preservation and abnormal architecture were better in TP slides for breast and metastatic cancer groups.
• Cell quality was inferior in TP slides for lymph node samples, particularly those with tuberculosis.
• TP and CS slides demonstrated similar quality in thyroid and salivary gland samples.
• TP slides facilitated easier diagnosis of benign lesions like fibroadenoma due to altered cell morphology.

Conclusions:

• ThinPrep (TP) slides provide improved cell quality for breast and metastatic cancer fine needle aspirations.
• Conventional smear (CS) slides may be preferable for lymph node samples, especially those with suspected tuberculosis.
• Similar diagnostic performance was observed between TP and CS for thyroid and salivary gland samples.
• Differences in diagnostic criteria exist between TP and CS, particularly for tuberculosis and reactive hyperplasia.