Ca cervix

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Carcinoma of the Cervix (Ca Cervix) - Topic Map

This is a broad topic. Here's the breakdown of what it covers:

Epidemiology & Risk Factors - HPV (16/18), multiple partners, early coitarche, smoking, immunosuppression, low SES
Pathogenesis & Precursor Lesions - HPV oncoproteins E6/E7, CIN (cervical intraepithelial neoplasia) grading, progression to invasive disease
Screening & Prevention - Pap smear, HPV DNA testing, colposcopy, HPV vaccination
Pathology - Squamous cell carcinoma (~80%), adenocarcinoma, adenosquamous, neuroendocrine/small cell variants; histologic patterns
Clinical Features - Post-coital bleeding, discharge, pelvic pain, presentation by stage
Diagnosis & Staging - Biopsy, colposcopy, imaging (MRI/CT/PET), FIGO 2018 staging (now incorporates imaging/pathologic findings)
Management by Stage - Conization/simple hysterectomy (microinvasive), radical hysterectomy + lymphadenectomy (early stage), chemoradiation (locally advanced), palliative chemo (metastatic)
Radiotherapy Principles - External beam + brachytherapy, concurrent cisplatin chemoradiation
Prognosis & Follow-up - 5-year survival by stage, recurrence patterns
Complications & Special Situations - Pregnancy with cervical cancer, fertility-sparing options (radical trachelectomy)

Brief overview: Cervical cancer is caused almost entirely by persistent high-risk HPV infection (types 16 and 18 account for ~70% of cases), which drives progression through cervical intraepithelial neoplasia (CIN I-III) to invasive carcinoma over years. Squamous cell carcinoma is the most common histology, followed by adenocarcinoma. Screening via Pap smear/HPV testing and HPV vaccination have dramatically reduced incidence in countries with organized programs. Diagnosis relies on colposcopy-directed biopsy, and staging (FIGO 2018) now allows imaging and pathologic findings in addition to clinical exam. Early-stage disease (confined to cervix, small volume) is managed surgically with radical hysterectomy and lymph node assessment, or fertility-sparing trachelectomy in selected young patients. Locally advanced disease is treated with concurrent cisplatin-based chemoradiation plus brachytherapy. Metastatic/recurrent disease is treated with systemic chemotherapy, often combined with bevacizumab or immunotherapy (pembrolizumab) in eligible patients.

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Carcinoma of the Cervix (Ca Cervix) - Topic Map

This is a broad topic. Here's the breakdown of what it covers:

Epidemiology & Risk Factors - HPV (16/18), multiple partners, early coitarche, smoking, immunosuppression, low SES
Pathogenesis & Precursor Lesions - HPV oncoproteins E6/E7, CIN (cervical intraepithelial neoplasia) grading, progression to invasive disease
Screening & Prevention - Pap smear, HPV DNA testing, colposcopy, HPV vaccination
Pathology - Squamous cell carcinoma (~80%), adenocarcinoma, adenosquamous, neuroendocrine/small cell variants; histologic patterns
Clinical Features - Post-coital bleeding, discharge, pelvic pain, presentation by stage
Diagnosis & Staging - Biopsy, colposcopy, imaging (MRI/CT/PET), FIGO 2018 staging (now incorporates imaging/pathologic findings)
Management by Stage - Conization/simple hysterectomy (microinvasive), radical hysterectomy + lymphadenectomy (early stage), chemoradiation (locally advanced), palliative chemo (metastatic)
Radiotherapy Principles - External beam + brachytherapy, concurrent cisplatin chemoradiation
Prognosis & Follow-up - 5-year survival by stage, recurrence patterns
Complications & Special Situations - Pregnancy with cervical cancer, fertility-sparing options (radical trachelectomy)

Brief overview: Cervical cancer is caused almost entirely by persistent high-risk HPV infection (types 16 and 18 account for ~70% of cases), which drives progression through cervical intraepithelial neoplasia (CIN I-III) to invasive carcinoma over years. Squamous cell carcinoma is the most common histology, followed by adenocarcinoma. Screening via Pap smear/HPV testing and HPV vaccination have dramatically reduced incidence in countries with organized programs. Diagnosis relies on colposcopy-directed biopsy, and staging (FIGO 2018) now allows imaging and pathologic findings in addition to clinical exam. Early-stage disease (confined to cervix, small volume) is managed surgically with radical hysterectomy and lymph node assessment, or fertility-sparing trachelectomy in selected young patients. Locally advanced disease is treated with concurrent cisplatin-based chemoradiation plus brachytherapy. Metastatic/recurrent disease is treated with systemic chemotherapy, often combined with bevacizumab or immunotherapy (pembrolizumab) in eligible patients.

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Types of pelvis

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Caldwell-Moloy classification types of female pelvis gynecoid android anthropoid platypelloid diagram

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Caldwell-Moloy classification types of pelvis gynecoid android anthropoid platypelloid characteristics obstetrics

Types of Pelvis (Caldwell-Moloy Classification)

The Caldwell-Moloy classification (1933) is the standard system used in obstetrics to describe pelvic shape based on the shape of the pelvic inlet and the posterior/anterior segments. There are four basic types, though most people have a mix (mixed type) rather than a pure form.

1. Gynecoid pelvis

Most common type in females (~50%)
Inlet is round to slightly oval (transversely)
Wide, well-rounded posterior segment; roomy anterior segment
Straight side walls, blunt ischial spines, wide sacrosciatic notch, wide subpubic arch (>90°)
Most favorable shape for vaginal delivery - allows the fetal head to engage and descend easily in the transverse or oblique diameter

2. Android pelvis

Resembles the typical male pelvis (~20% of women)
Inlet is heart-shaped/wedge-shaped (narrow anteriorly)
Narrow forepelvis, convergent side walls, prominent ischial spines, narrow sacrosciatic notch, narrow subpubic arch
Less favorable for labor - fetal head tends to engage in the transverse diameter and often gets arrested in a direct occipito-posterior position, leading to deep transverse arrest and higher risk of difficult/operative delivery

3. Anthropoid pelvis

~25% of women
Inlet is oval, elongated in the anteroposterior diameter (narrow transversely)
Long, narrow pelvis; sacrum often has extra segment (long sacrum)
Fetal head usually engages in the direct occipito-anterior or occipito-posterior position (AP diameter dominant)
Vaginal delivery is often possible but labor may be prolonged

4. Platypelloid pelvis

Least common (~5%)
Inlet is oval but flattened, wide transversely and short in the AP diameter (like a flattened gynecoid pelvis)
Wide transverse diameter but reduced AP diameter, especially at the inlet
Fetal head engages transversely but often has difficulty descending through the mid-pelvis and outlet - increased risk of transverse arrest and need for cesarean section

Feature	Gynecoid	Android	Anthropoid	Platypelloid
Inlet shape	Round/oval	Heart-shaped	Oval (AP long)	Oval (transverse)
Prognosis for vaginal delivery	Good	Poor	Fair	Poor
Approx. frequency	~50%	~20%	~25%	~5%

This classification is based on the shape of the pelvic inlet and is clinically relevant when assessing cephalopelvic disproportion, mode of engagement of the fetal head, and likelihood of a difficult labor (per Creasy & Resnik's Maternal-Fetal Medicine and standard obstetric texts). In practice, pure forms are uncommon - most women have a mixed pelvic architecture, and clinical/imaging pelvimetry (CT or MRI) is used when precise assessment is needed, such as before a trial of vaginal breech delivery.