The prostate Flashcards
What is the location of the prostate in comparison to the bladder?
Inferior
The prostate surrounds what?
The bladder neck and proximal urethra
What is the location of the prostate in relation to the symphysis
Posterior
What is the location of the prostate in comparison to the rectum?
Anterior
What is the location of the prostate in relation to the Levator ani muscles?
Posterolateral
What is the shape of the prostate? What way does the apex and the base face?
- Ovoid (inverted pyramid)
- Apex (caudal)
- Base (cephalic)
What is the size of the prostate?
Length: 3 - 3.5 cm
width: 4 cm
AP: 2- 2.5 cm
What is the weight of the prostate (volume)? 3
- 20 grams (20cc) up to 50 years
- <40 grams (40cc) over 50 years
- 1cc = 1g
What is the physiology of the prostate?
Fibromuscular and glandular organ
What does the prostate produce and secrete?2
- Alkaline fluid
- Prostate specific antigen
What does the alkaline fluid of the prostate do? 3
- consists of 1/3 of semen volume
- Aids in sperm motility and activating sperm
- Neutralizes acidity of vagina, uterus, and tubes
Prostate specific antigen (PSA) increases with what?
Age
What are the four zones of the prostate?
- Peripheral
- Transition
- Central
- Periurethral
How are the four zones of the prostate are positioned?
Positioned in relationship to the urethra and ejaculatory duct
What is the four zones of the prostate useful for?
Localization of cancer
What is the largest prostate zone?
Peripheral
Most prostate cancers are located in which prostate zone? And how frequent is it?
Peripheral and it has a 70% chance of being here
What does the peripheral zone surround?
Distal urethra
The Surgical capsule of the peripheral zone separates it from what?
Transitional zone and the central zone
What zone of the prostate is the prostate base?
The central zone
Which zone of the prostate does the ejaculatory duct travel through?
The central zone
What zone is the most resistant to disease?
The central zone
Which zone of the prostate terminates near verumontanum?
The central zone
Is there BPH in the peripheral zone?
Nope
Label the pictures
What is the transition zone?
2 small lobes on each side of the proximal urethra
What zone of the prostate is the origin of BPH
Transition zone
Which zone of the prostate enters at the proximal urethra at level of verumontanum
Transition zone
How much of the periurethral glandular area takes up in terms of gland volume?
1%
What does the periurethral glandular area do?
Internal prostatic sphincter
Where is the periurethral glandular area embedded?
In smooth muscle of proximal urethra
What is the fibromuscular stroma? What does it consist of?
- Non-glandular area, anterior surface of prostate
- Smooth muscle and connective tissue
How much of the prostate does the fibromuscular stroma take up?
1/3
Sonographically, it is difficult to do what for the prostate?
Identify separate zone
What is the location of the seminal vesicles?2 (in relation to the bladder and prostate)
- Posterior to bladder
- Superior to prostate
What is the dimensions of the seminal vesicles?
- Length: 3-4 cm
- Thickness: 1-3 cm
What is the shape of the seminal vesicles?2
- Paired
- Ovoid
What forms the ejaculatory ducts?
Vas deferens and the seminal vesicles
The ejaculatory duct empties into what?
Urethra
Why would we ultrasound the prostate? 6
- Positive DRE
- Increased PSA
- Urinary frequency/ nocturia/ decreased urine stream
- Male infertility
- Biopsy guidance
- Blood, pus in urine and/ or semen
In terms of the prostate, what do we assess for with transabdominal/ transvesicular? What would we need to do from the tech side? 3
- Size and volume only
- We would use a curvilinear transducer
- Ensure patients would need full bladder
When scanning the transabdominal area how would the prostate appear? 4 (shape, echoes, echo texture, central interface)
- Ovoid structure
- Low to moderate level echoes
- Homogenous
- Echogenic interface centrally
When imaging the seminal vesicles how would they look? 3
- Hypiechoic
- Symmetrical
- Medium/ low level echoes
Wat is TRUS?
Transrectal transducers: side firing or end-firing
Which TRUS is most common ?
End firing
What does end firing TRUS do? 2
- Multiplanar imaging
- Can be connected to a biopsy device
What is the frequency of the TRUS?
7-10 MHz or higher
The TRUS is usually covered with what?
Condom (inquire about latex allergies, the probe is also sterilized with a high level disinfectant)
What does the patient need to do for a TRUS?4
- Patient needs to have a empty bladder
- LLD position, legs bent to chest
- DRE performed prior to TRUS
- Systematic approach
What is the systematic approach for TRUS? 3
- Transverse (axial) and Sagittal (longitudinal) views
- From apex to base
- Measurements as needed
What is the TRUS scan orientation? (Sag and trans orientation) 3
- Rectum at bottom of image
- Sag: anterior abdominal wall at the top and patient’s head on the left side of the monitor
- Trans: anterior abdominal wall at top of the image and patient’s right displayed on the left side of the monitor
From left to right what is the images?
- Trans base
- Trans mid gland
- Trans Apex
What is the sonographic appearance of the peripheral zone?
Used as the echogenicity standard
What is the sonographic appearance of the surgical capsule? 2
- Separates the peripheral zone from the central zone
- Hypoechoic line
What is the sonographic appearance of the central zone?
Hyperechoic or isoechoic to peripheral zone
What is the sonographic appearance of the transition zone? 2
- Isoechoic to the peripheral zone
- Hypoechoic with BPH
What is the sonographic appearance of the corpora amylacea? 2
- Calcified deposits that may occur within the prostate
- Will appear as echogenic foci
What is the sonographic appearance of the periurethral glands? What demographic would this be more prominent in? 3
- Hypoechoic
- Blend with the urethra
- More prominent in young men
What is the sonographic appearance of the anterior fibromuscular stroma?
Hypoechoic compared to the peripheral zone
What is PSA?
Enzyme made almost exclusively in the prostate
Where is PSA secreted?
Through ducts in prostate
When would PSA be elevated? 3
- BPH
- Infection
- CA
not specific to cause
What is the normal range of PSA?
<4ng/ml
What is the PSA density test? and why do we do it? 2
- When we take the serum PSA level/ prostate volume
- Cancerous tissue produces more PSA
When would we need to do a biopsy for a PSA density test?
If density is >0.12. PSA level above the expected for the gland volume
Where is Acid Phosphatase found?
Prostate and semen
Why would we do a acid phosphatase test?
Increased in carcinoma that spreads outside the capsule
Where is the alkaline phosphatase produced? What increases it? 2
- Produced in bone
- Increased in bone metastases
What is vascular supply for the prostate? 2
- Prostaticovesical arteries
- Branches of the internal iliac arteries
What is Benign ductal ectasia?
1 to 2 mm tubular structures in the Peripheral zone
What can be mistaken for prostate cancer?
Benign ductal ectasia
What is the sonographic appearance of the benign ductal ectasia?
Hypoechoic
What are calcifications in the prostate? And why are they significant? 2
- Incidental findings
- Benign calcifications coarser in appearance than malignant