hyperchromatic crowded groups: what is your diagnosis … · hyperchromatic crowded groups term...
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Hyperchromatic Crowded Groups: What is Your Diagnosis ?
Session 3000
Thomas A. Bonfiglio, M.D. Professor Emeritus, Pathology and
Laboratory Medicine University of Rochester
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Disclosures
• In the past 12 months, I have not had a significant financial interest or other relationship with the manufacturer(s) of the product(s) or provider(s) of the services that will be discussed in my presentation.
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Hyperchromatic Crowded Groups
Term introduced by Dr. DeMay in the mid 90’s Refers to cellular “microbiopsies” with dark staining nuclei in Pap smears Almost always benign but in a small percentage of cases may represent a serious process In some cases the differential diagnosis can be very difficult
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Entities associated with HCG’s • BENIGN
• Endocervical cells
– Brush artifact – Tubal metaplasia – Reactive/Repair
• Endometrial cells – Menses – IUD effect
• Atrophy • Follicular cervicitis
• NEOPLASTIC
• HSIL/Squamous Ca • EC AIS • EC adenocarcinoma • Endometrial neoplasia • Small cell carcinoma • Extrauterine Ca
– Ovary – Colon – Breast
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Benign vs.. Neoplastic HCGs
• Important differential diagnostic decision – High potential for error when dealing with
Hyperchromatic Crowded Groups
• Problem cases often included in the “Atypical glandular cells” categories of the Bethesda system
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Evaluating Slides with HCG’s
• The groups
• The background
• The individual cells
• The history
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HCG Case Examples
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Case 1
51 year-old woman Liquid based Pap test
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What is your interpretation ?
1. Tubal metaplasia 2. Endocervical AIS 3. Metastatic adenocarcinoma 4. Reactive endocervical cells 5. Endometrial cells
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Diagnosis available at session
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Features of Endocervical AIS
•Isolated stratified strips •Increased N/C
Hyperchromasia Mitoses Apototic bodies
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Features of Endocervical AIS
Feathering Elongate tapered nuclei
Rosettes
Pseudostratification
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Reactive endocervical cells
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Tubal Metaplasia Cytologic Features
• Some features in common with AIS – Chromatin (Granularity/distribution) – Increased N/C ratio – Crowding and Hyperchromasia
• Differential Dx features – Large stripped nuclei – Cilia/terminal bars
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Tubal Metaplasia
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Tubal Met Tubal Metaplasia T
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Tubal Metaplasia
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Endometrial Cells can mimic AIS
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Proliferative Endometrium
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Metastatic adenocarcinoma
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Immunocytochemistry in cytology of Cervical glandular lesions
• p16inK4a • Ki-67 • ProEX C
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Immunocytochemistry in cytology of
glandular lesions
CINtec PLUS (p16/Ki-67) demonstrated potential to aide in the diagnosis of cervical glandular lesions in a recent study . (48 Cases)
• 92.5% of adequate neoplastic samples stained + • 7.5% inconclusive 15 (93.8%) of 16 negative
samples stained – • Sensitivity 88%, Specificity 94%
Ravarino A, Nemaolato S, Macciiocu E, et al, Am J
Clin Pathol. 2012 Nov, 138(5): 652-6.
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Immunocytochemistry in cytology of
glandular lesions
ProEx C has also demonstrated a potential to help triage atypical glandular cells in liquid based samples. (28 cases)
– 13 with subsequent positive biopsy, 10 were ProEx C +
– 15 with negative biopsy, 13 were ProEx C -, 2 were +
– Sensitivity 77%, Specificity 87%
Fletcher AH, Barllow TA, Murphy NJ, et al. J Low Genit Tract Dis, 2011 Jan 15 (1):6-10.
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55 year-old postmenopausal woman Vaginal spotting Last Pap test three years ago was negative
Case 2
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Case 2: The best interpretation is:
1. Normal Em cells 2. Reactive cell changes (IUD Effect) 3. Atypical Em cells, favor neoplastic 4. Atypical EC cells, favor neoplastic 5. Extrauterine (metastatic) carcinoma
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Diagnosis available at session
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Atypical EM’s; Differential Diagnosis
§ Benign changes § IUD effect, normal EM
§ Endometrial hyperplasia § Endometrial adenocarcinoma § Endocervical adenocarcinoma § Metastatic adenocarcinoma § HSIL
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IUD EFFECT
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Endometrial Neoplasia
Feature Simple Complex Atypical Cancer
# of Cells 107 142 245 538
Cell area (Sq micrometers)
89 98 116 149
Nuclear area 42 49 53 68
Relative nuclear area
47 50 46 46
Irregular chromatin
4 10 21 97
Nucleoli % cells 2 6 17 88
From: Wilbur , DC. Cytology of endocervix and endometrium. in Bonfiglio, TA and Erozan, YS, Gynecologic Cytopathology, Lippincott-Raven, 1997
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Endocervical vs.. Endometrial Adenocarcinoma
FFeeaattuurree EEnnddoocceerrvviiccaall EEnnddoommeettrriiaall
Celluarity +++ + Diathesis Tumor Watery Cell & Nuclear size Larger Smaller Cytoplasm Ampho/Eosinophilic Cyanophilic Cytoplasm amount +++ + Nucleoli +++ + Multiple nucleoli ++ + Cell configuration Columnar Round to Oval
Group arrangement 2 dimensional 3 dimensional
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Ovarian Carcinoma
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Metastatic Carcinoma
Metastatic Breast Carcinoma Metastatic Colonic Carcinoma
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CDX-2
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Endometrium vs.. HSIL
Endometrial HSIL (Small cell type)
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Endometrial lesions vs.. HSIL
Endometrial
• 3 dimensional clusters
• Smudgy degenerative chromatin
• Presence of endometrial stromal cells
HSIL
• Syncytial like groups
• Granular often coarse chromatin
• Presence of single dysplastic cells
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Case 3
31 year old woman Routine Pap test
SurePath
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Case 3: What is your diagnosis ?
1. NILM (Endometrial cells) 2. HSIL (with gland involvement) 3. Atypical EC cells 4. Adenocarcinoma in situ 5. Invasive squamous carcinoma
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Diagnosis available at session
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IHC P-16
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Evidence of squamous origin
Surface Flattening
Surface flattening
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Evidence of Squamous origin
– Lack of typical AIS features
• Elongate nuclei • Isolated Strips • Feathering • Rosettes
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Summary
•HSIL In Glands Mimics Atypical EC Cells
•HSIL is the most common neoplastic Dx on biopsy after Atypical EC Pap.
•Careful evaluation of features can often but not always lead to correct interpretation.
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AIS and HSIL may coexist
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Case 4
65 year old Liquid based Pap
History of Abnormal Pap in past
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What is your interpretation ?
1. HSIL 2. Negative (Atrophy) 3. Atypical Endocervical Cells 4. Squamous Cell Carcinoma 5. Endometrial Carcinoma
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Diagnosis available at session
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HSIL vs.. atrophy
HSIL
• Higher N/C • Single dysplastic cells • Coarse chromatin • Mitoses (rare) • Usually more
hyperchromatic
Atrophy
• Lower N/C • Parabasal like cells • Smudgy or fine • No mitoses • Usually less
hyperchromatic
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HSIL vs. Atrophy
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HSIL vs. Atrophy
Single cells
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Squamous cell carcinoma
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Uncommon Entities with HCG’s
• Small cell carcinoma • Lymphoma
• EM stromal cells • Chronic lymphocytic cervicitis
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Small cell carcinoma
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Cytologic Features
• Similar to SCC at other sites • Groups and single cells • Scant cytoplasm • “Powdery” chromatin • Inconspicuous nucleoli • Nuclear molding • Streaming nuclear material (Conventional
Paps) • Tumor diathesis
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Differential Diagnosis
• Basaloid squamous cell carcinoma • HSIL • Lymphoma • Endometrial stromal cells • Chronic lymphocytic cervicitis
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Squamous Carcinoma
Endometrial Stromal Cells
HSIL
Cervical Lymphoma
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Potentially useful markers
• HPV testing (Commonly HPV 18 positive) • Neuroendocrine Markers
– Chromogranin, Synaptophysin, CD 56
• TTF-1 ( Small percentage 10-20 % in most studies.)
• p63 negative (or weakly positive)