Utility of cell block preparation in diagnosis of paediatric abdominal neoplasms

Objectives: To determine the role and efficacy of fine needle aspiration cytology (FNAC) and cell block in diagnosis of jaw lesions and compare the agreement between FNAC and cell block to predict the diagnosis. Method: The sample comprised 51 cases, including 12 odontogenic keratocysts (OKCs), 8 ameloblastomas, 22 radicular cysts, 7 dentigerous cysts, and 1 each of intraosseous mucoepidermoid carcinoma (MEC) and adenomatoid odontogenic tumor (AOT). FNAC samples remaining after hematoxylin and eosin (H&E)-stained cytosmear diagnosis were centrifuged at 3,000 rpm for 10 min. The supernatant was discarded and sediment mixed with 2–3 mL alcohol and filtered. To this, 10% formalin was added, filtered, taken for routine processing, and stained with H&E. The result of FNAC smear and cell block was compared with histopathological diagnosis. Results: On cytological examination of the smears, 7 OKCs and 22 radicular cysts were diagnosed, whereas ameloblastomas, AOT, intraosseous MEC, and dentigerous cysts were not. This gave an agreement of 56.8% with the biopsy reports. Cell block sections stained with H&E of 12 OKCs, 22 radicular cysts, 1 MEC, and 3 cases of ameloblastoma offered a diagnosis in accordance with the biopsies giving an agreement of 74.5%, while dentigerous cyst and AOT failed to do so. In comparison with FNAC, additionally 5 cases of OKC and 1 of MEC could be detected, and in ameloblastoma, out of 8 cases, only 3 yielded a concordant diagnosis through the cell block technique. Conclusion: In comparison with FNAC, the architectural pattern and the morphology of the cells were better preserved by the cell block technique. This substantiates that cell block could be used as an ancillary technique to aid in definitive diagnosis of head and neck swellings.

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Validation of PD-L1 Immunohistochemical Testing on Formalin Fixed Paraffin Embedded (FFPE) Cell Block (CB) Preparations

Journal of the American Society of Cytopathology ◽

10.1016/j.jasc.2020.07.105 ◽

2020 ◽

Vol 9 (6) ◽

pp. S53-S54

Author(s):

Priyanka Karam ◽

Yonah Ziemba ◽

Sean Hacking ◽

Karen Chau ◽

Suganthi Soundararajan ◽

...

Keyword(s):

Cell Block ◽

Formalin Fixed Paraffin ◽

Formalin Fixed Paraffin Embedded ◽

Formalin Fixed ◽

Immunohistochemical Testing

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Cell Block Optimization: A Comparative Study of Quality Variables in 4 Different Cell Block Methods

Acta Cytologica ◽

10.1159/000516384 ◽

2021 ◽

pp. 1-7

Author(s):

Marsali Newman ◽

Matthew Walsh ◽

Rosemary Jeffrey ◽

Richard Hiscock

Keyword(s):

Comparative Study ◽

Processing Time ◽

Morphological Features ◽

Cell Block ◽

Total Processing Time ◽

Block Methods ◽

Molecular Studies ◽

Agar Method ◽

Md Anderson ◽

Ancillary Studies

Objective: The cell block (CB) is an important adjunct to cytological preparations in diagnostic cytopathology. Optimizing cellular material in the CB is essential to the success of ancillary studies such as immunohistochemistry (IHC) and molecular studies (MS). Our aim was to identify which CB method was most suitable in a variety of specimen types and levels of cellularity. Study Design: We assessed 4 different CB methods, thrombin clot method (TCM), MD Anderson method (MDAM), gelatin foam method (GFM), and agar method (AM), with descriptive observations and ranking of the methods based on quantity of cells and morphological features. Results: TCM performed best in ranking for both quantity of cells and morphological features, followed by MDAM, GFM, and AM. Lack of adjuvant in the MDAM resulted in some unique morphological advantages which, however, also resulted in inconsistent performance. In low cellularity cases insufficient cells were frequently identified on slides from MDAM and AM CBs. Technique touch time was similar for all methods, with total processing time being shortest for TCM followed by MDAM, GFM, and AM. Conclusions: TCM was the most robust CB technique, retaining high scores for ranking of quantity and morphology in a variety of specimen cellularities and specimen types.

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PD-L1 Immunohistochemistry on Cell Block Preparations From Different Fixatives: A Pilot Study

American Journal of Clinical Pathology ◽

10.1093/ajcp/aqz118.007 ◽

2019 ◽

Vol 152 (Supplement_1) ◽

pp. S95-S95

Author(s):

Victoria Costa ◽

David Kim ◽

Abha Goyal ◽

Bing He ◽

Yifang Liu ◽

...

Keyword(s):

Pilot Study ◽

Personalized Medicine ◽

Cell Block ◽

Fixation Methods ◽

Tonsillar Tissue ◽

Fixed Cell ◽

Specific Fixation ◽

Formalin Fixed

Abstract Objectives Immunohistochemistry especially for biomarkers such as PD-L1 in personalized medicine is increasingly being performed on cell blocks from cytopathology samples. We evaluated the effects of staining cell blocks (CBs) from different cytologic fixatives using four different commercially available PD-L1 antibody clones. Methods PD-L1 immunohistochemistry (IHC) using four different commercially available clones was performed on eight cell blocks processed from two different fixatives and also on eight formalin-fixed tissues. The clones used were 22C3 at 1:50 dilution and 1:100 dilution, SP263, SP142, and E1L3N. The cell block (CB) samples contained cells that strongly express PD-L1 and either fixed in CytoLyt (methanol-based fixative, n = 4) or CytoRich (ethanol-formalin-based fixative, n = 4). Formalin-fixed control tissues (tonsillar tissue, n = 4; stomach, n = 4) were also included. Results Expression for PD-L1 was noted on all the CytoRich fixed cell blocks (n = 4) for all four antibody clones, with the intensity and distribution of expression comparable to the formalin fixed tissues (n = 8). However, consistent absence of expression for PD-L1 was noted on all the CytoLyt fixed cell blocks (n = 4) for all four antibody clones. Conclusion The results of this pilot study demonstrate that PD-L1 IHC on cell blocks is feasible. However, there is a need to validate IHC protocols according to specific fixation methods.

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Small Cell Carcinoma of the Uterine Cervix in a Pregnant Patient Diagnosed with Liquid Based Cytology and Cell Block Immunocytochemistry

Case Reports in Pathology ◽

10.1155/2014/971464 ◽

2014 ◽

Vol 2014 ◽

pp. 1-5 ◽

Cited By ~ 2

Author(s):

Mawuli F. Attipoe ◽

Charles D. Sturgis

Keyword(s):

Cell Carcinoma ◽

Small Cell Carcinoma ◽

Uterine Cervix ◽

Case Reports ◽

Pregnant Patient ◽

Small Cell ◽

Tumor Type ◽

Cell Block ◽

Current Case ◽

Small Series

Definitive cytomorphologic diagnosis of small cell carcinoma of the uterine cervix is possible but can be challenging in routine cervicovaginal cancer screening specimens. Several small series of reported cases of cervical small cell carcinoma have shown this uncommon malignancy to represent fewer than 2% of all invasive cervical cancers. This tumor type is associated with poor prognosis and rapid disease progression and can develop to an advanced stage in the interval between screening visits. Only rare case reports of small cell carcinoma arising in gravid cervices are known. In the current case a 29-year-old, gravida 6, para 2, pregnant (10-week gestation) female presented with postcoital bleeding. A definitive diagnosis of small cell carcinoma of the cervix was made possible by liquid based Pap testing with ancillary cell block preparation allowing for immunocytochemical characterization of the lesional cell population.

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