PATHOMA Flashcards
describe the anatomy of the vulva
skin and mucosa outside hymen
1- labias
2- mons pubis
3- vestibule
describe the histology of the vulva, vagina, cervix (lining)
vulva: lined by keratinized squamous epithelium
vagina: lined by NONkeratinized squamous epithelium
exocervix: lined by NONkeratinized squamous epithelium
endocervix: lined by SINGLE layer of columnar cells
(note: junction is the TRANSFORMATION ZONE SOS)
women in reproductive age
presents with
unilateral pain and cystic dilatation on the vulva
what is it?
where do you expect to see the dilatation?
pathogenesis?
bartholyn cyst
in the LOWER vestibule adjacent to the vaginal canal
d/t inflammation, the duct gets obstructed —> leading to dilatation of the bartholin gland —> cyst maybe abscess too
what is condyloma
painless genital warts
warty neoplasm of squamous epithelium
how to differentiate between high risk and low risk HPV?
based on DNA sequencing
low: 6,11 (leads to condyloma)
high: 16,18,31,33 (leads to dysplasia then ca)
what is the HALLMARK of HPV infected cells?
KOLIOCYTES ! (nucleus look WRINKLED)
where do we see :
condyloma acuminatum
condyloma latum:
acuminatum: HPV
latum: syphilis
differentiate between lichen sclerosis and lichen simplex chronicus in terms of:
- women age
- presentation and cause
- benign vs malignant
- risk of SCC
-women age
lichen sclerosis: POSTMENOPAUSAL
lichen simplex chronicus: any age, usually young
-presentation and cause
lichen sclerosis: LEUKOPLAKIA (PARCHMENT-LIKE VULVAR SKIN)
note: EPIDERMIS thins and DERMIS fibrosis (sclerosis) —AU usually
lichen simplex chronicus: LEUKOPLAKIA (THICK LEATHERY VULVAR SKIN
HYPERPLASIA)
note: hyperplasia d/t chronic irritation and scratching
-benign vs malignant
lichen sclerosis: BENIGN
lichen simplex chronicus: BENIGN
-risk of SCC
lichen sclerosis: INCREASED RISK
lichen simplex chronicus: NO RISK
2 causes of vulvar carcinoma with age
1- HPV 16, 18 (40-50 usually)
2- Non-HPV (long-standing lichen sclerosis) - age >70 yrs
leukoplakia DD 3
1- lichen sclerosis
2- lichen simplex chronicus
3- vulvar carcinoma (need biopsy)
pathophysi of HPV cases vulvar carcinoma
arises from vulvar intraepithelial neoplasia (VIN) -neoplasia limited to epithelium -dysplasia characterised by: 1- koliocytic change 2- disordered cellular maturation 3- nuclear atypia
presence of malignant epithelial cells in epidermis of vulva (carcinoma in situ)
extramammary paget disease
usually no underlying malignancy
extramammary paget dx vs paget dx of the nipple, which one has underlying malignancy?
paget dx of nipple
diagnose
erythematous, pruritic, ulcerated vulvar skin
extramammary paget dx
DD b/w paget cells (extamammary paget dx) and melanoma (similar there is malignant cells in the epidermis)
1- KERATIN
2- S100
3- PAS
paget cells
1- KERATIN +ve (epithelial)
2- S100 -ve
3- PAS + ve
melanoma
1- KERATIN -ve
2- S100 +ve
3- PAS -ve
reminder embryological origin of the vagina
upper 2/3: mullerian duct
lower 1/3: urogenital sinus
what is vaginal adenosis? and pathophys
persistence of COLUMNAR epithelial cells in UPPER VAGINA
-During development, squamous epithelium from lower 1/3rd of vagina (derived
from urogenital sinus) grows up to replace columnar cells (derived from
Mullerian ducts)
cause of vaginal adenosis?
use of DES !! (diethylstilbestrol) in utero
complication of vaginal adenosis? sos
progression to clear cell adenocarcinoma of vagina
-> MALIGNANT proliferation of glands with clear cytoplasm
bleeding with grape like mass protruding from vagina OR penis (seen <5 yrs)
- diagnosis?
- what is the mass called?
-embryonal rhabdomyosarcoma
(rare cancer)
- SARCOMA BOTRYOIDES !!!
what does a biopsy of embryonal rhabdomyosarcoma show (2)
1- rhabdomyoblast (malignant proliferation of immature skeletal muscles) sos: cytoplasm shows CROSS STRIATIONS similar to muscle fibers
2-POSITIVE IMMUNOHISTOCHEMISTRY for DESMIN and MYOGENIN !!
what is vaginal carcinoma?
malignant proliferation of SQUAMOUS epithelium lining vaginal canal
cause of vaginal carcinoma?
what is the precursor lesion called?
HPV 16 18 31 33
VAIN (vaginal intraepithelial neoplasia)-dysplasia in epithelium
lymph spread of vaginal carcinoma 2
1- upper 2/3 (from MD) spread to ILIAC NODES
2- lower 1/3 (from UGS) spread to INGUINAL LYMPH NODES
3 characteristics of CIN
1- koliocytic change
2- nuclear atypia
3- increased mitotic activity
CIN grades of dysplasia 4 then develops into …..
what stages are reversible ?
CIN I (1/3 epithelium thickness) CIN II (2/3 epithelium thickness) CIN III (almost complete thickness) CIS (carcinoma in situ): (entire thickness) NO INVASION OF BM
into invasive SCC (and not ADENOCARCINOMA —> cells of the endocervix)
CIN I II III are REVERSIBLE , CIS is IRREVERSIBLE
main difference b/w dysplasia and carcinoma
reversibility
what region in the lower genital tract is especially infected with HPV ?
transformation zone of the cervix
remember
- Infection usually eradicated by acute inflammation
- PERSISTENT !! infection can lead to cervical dysplasia and cervical intraepithelial neoplasia (CIN)
most common cause of SCC of genitourinal tract
HPV
SOSOSOOSOS
pathophysio of HPV infection leading to cancer 2
produces proteins:
1- E6 (inactivates p53)
tumor suppressor gene regulate G1 to S phase (looks at damaged DNA), if little damage fix it by repair enzymes. if too much damage: induce apoptosis calls BAX (bcla-2 decrease) thus loss of mitoch membrane stability, cytochrome C leaks leading to apoptosis
2- E7 (inactivates Rb)
Rb holds ETF another tumor suppressor gene essential for cell cycle
HPV vaccination (QUADRIVALENT) each type prevents what? protects for how long? is it necessary to do a pap smear after?
-HPV 6 11 prevents against condylamata accuminata
HPV 16 18 prevents against CIN and cervical cancer
- 5years
- necessarily incase of infection from other subtypes 31 33
HPV can lead to what types of cancers (esp in cervix)?
SCC
ADENOCARCINOMA
middle aged women 40-50 yrs
present with postcoital bleeding and vaginal bleeding
what to think of?
cervical carcinoma
probably got infected with HPV 25 years ago :) and didnt perform any pap smears
sos 3 main risk factors for cervical carcinoma:
1- HPV infection
2- IMMUNOSUPPRESSION (it is an AIDS defining illness)
3- SMOKING
smoking leads to what 2 cancers that are not directly affected (i.e lungs pharynx etc,,,) ?
1- cervix
2- pancreas
sos
complication of cervical cancer
if the tumor invades through anterior uterine wall to the bladder and blocks the ureters: leads to HYDRONEPHROSIS and post RENAL FAILURE (common cause of death)
gold standard screening for cervical cancer, to screen for what type?
pap smear (note only for SCC type)
how long it takes CIN to develop to carcinoma?
10-20 years
how frequent should women do pap smear?
cells are scraped using the brusher from where?
- every 3 years >21 yrs
- transformation zone
what is the confirmatory test after positive screening test (pap smear) foor cervical ca?
Colposcopy + biopsy !!
2 limitations of pap smear ?
1- ONLY for SCC (not for adenocarcinoma)
2- FALSE -ve if transformation zone is not sampled :)
review histology of abnormal pap smear
and comment on 3 abnorma findings
features of dysplasia
1- hyperchromatic dark nucleus
2- large nucleus
3- high nucleus to cytoplasm ratio
hormone cycle of the endometrium 3 (phase name, hormone, physio)
1- proliferative phase, estrogen, endo grows
2-secretory phase, progesterone, endo prepares for implantation
3- menstrual phase, loss of progesterone, endo falls
secondary amenorrhea
d/t loss of BASALIS (stem cell) and scarring
diagnose
asherman syndrome
overagressive dilatation and curettage (D&C) can cause ..
asherman syndrome
what is a common cause of dysfunctional uterine bleeding during MENARCHE and MENOPAUSE ?explain how?
anovulatory cycle (lack of ovulation) b/c of no ovulation, corpus luteum doesn’t develop thus no progesterone is made. endo develops by estrogen but not maintained by proges, so falls off
after delivery or miscrriage: fever abnormal uterine bleeding pelvic pain diagnose? how?
acute endometriris
-retained products of conception serves as the nidus of infection
abnormal uterine bleeding pain INFERTILITY w/ (retained products of infection, IUD, TB, PID (gonorrhea, CHLAMYDIA) diagnose:
chronic endometritis
acute vs chronic endometritis
type of inflammation?
- acute: BACTERIAL infection of endo
- chronic: PLASMA CELLS (and lymphocytes) in biopsy sos
MoA of TAMOXIFEN?
can lead to?
- ANTI-estrogenic effect on BREAST
- PRO-estrogenic effect on endome
thus can lead to ENDOMETRIAL POLYP
abnormal uterine bleeding after the use of tamoxifen (for breast ca), what is it???
endometrial polyp (d/t HYPERPLASTIC protrusion of endometrium)
what is endometriosis ? definition
GLANDS and STROMA !!outside uterine endometrial lining (note that the glands follow normal menstruation cycle)
what are the 3 theories in order for the causes of endometriosis?
1- RETROGRADE menstruation with implantation at an ectopic site
2-Mullerian ducts lead to endometrial METAPLASIA
3- LYMPHATIC dissemination
what is the most common site of endometriosis?
OVARY (makes hemorrhagic- chocolate cyst !!!!)
remember: common sites of endometriosis and symptoms
-Ovary (most common) - makes hemorrhagic (aka chocolate) cyst
-Uterine ligament - cause pelvic pain
-Pouch of douglas - pain with defecation
-Bladder wall - pain with urination
-Bowel serosa - abdominal pain and adhesions
-Fallopian tube mucosa - scarring increases risk for ectopic tubal pregnancy
-Adenomyosis - if endometriosis occurs in myometrium of uterus
when soft tissue is involved: Sites classically appear as yellow-brown ‘gun powder’ nodules
if endometriosis occurs in the myometrium. what is it called?
ADENOMYOSIS
- pain before/after/during menstruation
- pain during sex, urinating or bowel movements
- severe disabling pain or chronic pain
endometriosis
IMPORTANT complication of endometriosis? special location?
increased risk of carcinoma at site of endometriosis !!!
esp in ovary: ENDOMETOID TUMOR
postmenopausal uterine bleeding could indicate: … which is …
endometrial HYPERPLASIA , hyperplasia of endometrial GLANDS! relative to STROMA
or endometrial carcinoma (if theres cellular atypia)
what is the cause of endometrial hyperplasia
UNOPPOSED ESTROGEN
1- obesity
2- PCOS
3- estrogen replacement
most important predictor for progression from hyperplasia to carcinoma?
CELLULAR ATYPIA !
what is the most common incasive carcinoma of female genital tract?
endometrial carcinoma (malignant proliferation of endometrial GLANDS!)
endometrial carcinoma 2 causes
1- hyperplasia 75%
2- sporadic 25%