Pathology Cheat Sheet
Find the Transformation Zone
Cervical neoplasia for NEET-PG exams: transformation zone, HPV 16 and 18 with E6 E7, CIN grading, koilocytes, Pap smear screening, and cervicitis causes.
MedNext Academy | 3 min read
Clinically reviewed by Dr Shameer Deen, MBBS, MS, MRCS
Find the Transformation Zone
Cervical neoplasia for NEET-PG exams: transformation zone, HPV 16 and 18 with E6 E7, CIN grading, koilocytes, Pap smear screening, and cervicitis causes.
Cervicitis and the pathogenesis, screening and progression of cervical carcinoma.
High-yield lines
- The transformation zone at the squamocolumnar junction is the site of cervical neoplasia.
- Persistent high-risk HPV infection, especially types 16 and 18, drives cervical carcinoma.
- HPV E6 protein degrades p53 and E7 inactivates Rb, disabling tumour suppressor pathways.
- Cervical intraepithelial neoplasia progresses from CIN1 through CIN3 before invasive carcinoma.
- Koilocytes are HPV-infected squamous cells with perinuclear halos and raisinoid nuclei.
- The Papanicolaou smear screens for precancerous cervical lesions at the transformation zone.
- Squamous cell carcinoma is the most common histological type of cervical carcinoma.
- HPV vaccination targets high-risk types to prevent cervical cancer.
- Cervicitis is inflammation of the cervix, commonly caused by Chlamydia, gonorrhoea, and herpes.
- Cervical cancer spreads by direct extension to the parametrium and can obstruct the ureters.
- Adenocarcinoma of the cervix is also HPV-related and is rising in relative frequency.
- Cervical cancer is a leading cancer in Indian women, and screening reduces mortality.
Mapped competency codes
- PA30.1
- PA30.6
Continue into the full chapter
This summary maps to PA30-female-genital-tract.
Frequently Asked Questions
What drives cervical carcinoma?
Persistent infection with high-risk human papillomavirus, especially types 16 and 18, whose E6 and E7 oncoproteins inactivate p53 and Rb.
What is a koilocyte?
An HPV-infected squamous cell with a perinuclear clear halo and a wrinkled raisinoid nucleus, a hallmark of HPV cytopathic effect.
Where does cervical neoplasia arise?
At the transformation zone, the squamocolumnar junction where metaplastic squamous epithelium is susceptible to HPV-driven dysplasia.
How does cervical cancer spread and cause renal failure?
By direct extension into the parametrium, which can encase and obstruct the ureters, leading to hydronephrosis and renal failure.
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