Pathology Cheat Sheet
Read the Smear Systematically
Cytology smear reading for NEET-PG: nuclear-to-cytoplasmic ratio, hyperchromasia, pleomorphism, loss of cohesion, tumour diathesis, and Bethesda reporting.
MedNext Academy | 3 min read
Read the Smear Systematically
Cytology smear reading for NEET-PG: nuclear-to-cytoplasmic ratio, hyperchromasia, pleomorphism, loss of cohesion, tumour diathesis, and Bethesda reporting.
Systematic interpretation of a cytology smear, focusing on the cellular features that distinguish benign from malignant cells.
High-yield lines
- Smear interpretation assesses cellularity, cell arrangement, nuclear features, cytoplasm, and background.
- Malignant cells show a high nuclear-to-cytoplasmic ratio compared with benign cells.
- Nuclear hyperchromasia reflects increased and coarsely clumped chromatin in malignant cells.
- Pleomorphism is variation in cell and nuclear size and shape and is a feature of malignancy.
- Prominent and irregular nucleoli suggest malignancy, particularly in adenocarcinoma.
- Loss of cohesion with dispersed single cells favours malignancy over benign tightly cohesive clusters.
- An irregular thickened nuclear membrane is a malignant feature, unlike the smooth membrane of benign cells.
- A necrotic or bloody tumour diathesis background can accompany malignant smears.
- Benign reactive cells retain uniform nuclei, fine chromatin, and preserved polarity.
- Abnormal mitotic figures support malignancy, while normal mitoses can occur in reactive processes.
- The Bethesda system standardises reporting of cervical cytology results.
- Correlation with clinical findings and, when needed, biopsy improves cytological accuracy.
Mapped competency codes
- PA8.3
Continue into the full chapter
This summary maps to PA8-basic-diagnostic-cytology.
Frequently Asked Questions
Which nuclear features suggest malignancy on a smear?
A high nuclear-to-cytoplasmic ratio, hyperchromasia with coarse chromatin, an irregular thickened nuclear membrane, and prominent irregular nucleoli.
How does cell cohesion help distinguish benign from malignant cells?
Benign cells tend to remain in cohesive clusters with preserved polarity, whereas many malignant cells lose cohesion and appear as dispersed single cells.
What is tumour diathesis?
A necrotic and bloody background on a smear that accompanies some malignancies, supporting a malignant interpretation.
Which system standardises cervical cytology reporting?
The Bethesda system, which provides uniform categories for reporting Pap smear findings.
Continue reading
Cheat SheetsAll Pathology cheat sheets
Browse the complete authored set for this subject.
Open the complete revision pathway
Explore clinician-written learning resources, structured revision and practice across the MedNext platform.
Open in the MedNext appSee plans

