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Cell Block Preparation from Cytology Specimen with Predominance of Individually Scattered Cells
Published on: July 21, 2009
Testing automated liquid-based cytology samples with a manual liquid-based cytology method using residual cell
John A Maksem1, Vijaya Dhanwada, Joy E Trueblood
1Bostwick Laboratories, 2500 Sand Lake Road, Orlando, Florida 32809, USA. jmaksem@bostwicklaboratories.com
Diagnostic Cytopathology
|May 9, 2006
Summary
A refined manual liquid-based cytology (MLBC) method improves squamous intraepithelial lesion (SIL) detection compared to automated methods. This technique ensures more comprehensive analysis of patient samples, potentially uncovering "rare events" missed by automated systems.
Area of Science:
- Cytopathology
- Cellular analysis
- Diagnostic accuracy
Background:
- Automated liquid-based cytology (ALBC) is widely used for cervical cancer screening.
- Previous methods may not capture all diagnostic material from the original sample suspension.
- Improvements in slide preparation techniques are crucial for enhancing diagnostic yield.
Purpose of the Study:
- To report a technical improvement in manual liquid-based cytology (MLBC).
- To evaluate the diagnostic concordance between the improved MLBC method and standard ALBC using residual ThinPrep specimens.
- To assess the frequency of detecting squamous intraepithelial lesions (SILs) with an exhaustive MLBC approach.
Main Methods:
- A refined MLBC method was developed using centrifugation and polymer gel sedimentation.
- Residual cell suspensions from 500 ThinPrep cases were processed.
- Slides were prepared, stained, and examined by cytopathologists, with adjudication for discordant diagnoses. Focus was on LSIL or greater outcomes.
Main Results:
- The improved MLBC method identified additional high-grade squamous intraepithelial lesions (HSILs) and low-grade squamous intraepithelial lesions (LSILs) across all tested specimen groups.
- Specifically, 3 HSILs and 30 LSILs were found in HR-Negatives, and 3 HSILs and 9 LSILs in HR-ASC-US cases.
- Screening cytology specimens yielded 1 carcinoma, 3 HSILs, and 20 LSILs, indicating a higher detection rate than initially diagnosed.
Conclusions:
- The improved MLBC method is effective for preparing cell suspensions for cytological examination.
- This exhaustive analytical approach is valuable for assessing the representativeness of ALBC instruments.
- Automated systems may overlook "rare events" or cohesive cell aggregates, leading to underdiagnosis of SILs.
