Scrotum Flashcards
Externally, _________ divides into two compartments
The Raphe
Internally what merges centrally to form the internal scrotal septum?
Dartos tunica
Internally (scrotal), _________ merges centrally to form internal scrotal septum
Dartos Tunica
What is the thickness of scrotal wall?
2-8 mm
What is the scrotum lined by?
Tunica vaginalis
How many layers of tunica vaginalis? What are they?
Two layers
1. Parietal
2. Visceral
How much fluid is between each layer o the tunica vaginalis?
1-2 ml of fluid between layers normal
What is a pouch of loose skin and fascia?
Scrotum
What does the scrotum contain? 4
- Testicles
- Epididymis
- Vas deferents
- Spermatic cord
What does the testicles produce?
Sperm and testosterone
What is the shape of the testicles? What is the dimensions?
Oval shape
Length: 3-5cm
Width: 2-4 cm
AP: 3cm
Does the testicles decrease in size? Why?
They decrease with advance age
What is the tunica albuginea? What does it form?
- Fibrous layer surrounding testes
- Form the mediastinum posteriorly
Invaginations of the tunica albuginea divide the testicles into what?
Lobules
What does each lobule contain? What are they the site for?
- Seminiferous tubule
- Spermatogenesis
What is the mediastinum formed by?
The converging of the thin septations of the tunica albugenea
Where is the mediastinum functions?
Forms and supports for testicular vessels and ducts from extending from testes
Where is the mediastinum located?
Posterior testes
Where does the rete testes converge? Where do they join to form?
- Converging of seminiferous tubules at the mediastinum
- Join to form efferent ducts
What does Rete testes carry?
Seminal fluid to the epididymis
What is the bare area?
Testes tethered to scrotal wall by visceral layer of the tunica vaginalis
Where is the point of attachment for the bare are?
Posterior
What area is not covered by peritoneum and is a small portion of the posterior testis and epididymis?
Bare area
What is a appendix testes? Does it have a function? Where is it located?
- Remnant of the Müllerian duct; no function
- Upper pole of the testes
What is the epididymis shaped like?
Comma shaped structure
Where is the head and the body of the epididymis located?
Head: superior
Body: Posterolateral
What does the tail of the epididymus empties into?
Vas Deferens
How long is the epididymus?
6-7 cm length
What is the epididymus formed by?
The convergence of the efferent ducts from rete testes
What is the dimensions of the epididymus?
Head: 5-12mm
Body: 2-4mm
Tail: 2-5mm
What is another name of the head of the epididymus?
Globus major
What is the function of the epididymus? 3
- Conveys sperm to SV (SV are reservoirs for seminal fluid)
- Stores small quantities of sperm
- Maturation of sperm
What is the appendix epididymis a remnant of? What is it typically seen with?
- Remnant of mesonephric (wolffian) duct
- Typically seen with hydrocele
What does the spermatic cord connect?
Testes to pelvis/abdomen
What does the spermatic cord do?
Suspends testes in scrotum
Where does the spermatic cord travel through?
The inguinal canal
What does the spermatic cord contain? 5
- Vas deferens
- Arteries
- Pampiniform plexus
- Lymphatic
- Nerves
Ln pav
What is the arterial supply for the scrotum? 3
- Testicular arteries
- Deferential arteries
- Cremasteric arteries
Where does the testicular arteries originate and what doe they supply? 2
- Aorta, anterior origin
- Supply the testicles
Where is the origin of the deferential arteries? What do they supply?
- Inferior vesical artery
- Supply epididymus and vas deferens
Where is the origin of the cremasteric arteries? And what do they supply?
- Inferior epigastric artery
- Supply peri testicular tissue
Where does venous drainage happens in the scrotum? Where does each side drain into?
- Via pampiniform plexus
- Empties into testicular veins
- Right drains into the IVC
- Left drains into the LRV
Will we use doppler for scrotal ultrasound?
Yes,
1. Testicular artery- low resistance
2. Cremasteric and deferential - high resistance
What is the patient prep for a scrotal ultrasound?
- Patient in supine position
- Scrotum supported with towels
- Penis covered with towel
- Comfortable room temp, warm gel
When palpable masses what must we do? 3
- Request the patient localize the palpable mass
- Once localized, request permission to touch the patient and palpate the mass (individual site policies may require a chaperone)
- If consent given, palpate the region of interest
What is the transducer we will use for scrotal ultrasound?
12MHz transducer or higher
How do we document the scrotum? What do we assess? 4
Two planes and assess
1. Epididymis
2. Blood flow in testicles
3. Scrotal wall thickness
4. Transverse of both testes together
What do we look for during a sagittal scrotal ultrasound?
- Lateral, mid, medial
- Epi head/ superior testicle
What do we look for during a transverse image of a scrotum?
- Superior
- Mid
- Inferior
Why would we look for scrotum on ultrasound? 8
- Palpable masses
- Pain
- Enlarged scrotum
- Cystic vs solid
- Torsion
- Undescended testes
- Trauma
- Post orchiectomy
Pet put pc
What is the normal sonographic appearance of testes? 2 (echo textures)
- Homogenous
- Medium levels of echoes (similar to the thyroid)
What is the sonographic appearance of the mediastinum for each plane? (sag + trans)
- Sagittal: hyperechoic line from superior to inferior
- Transverse: Hyperechoic region medially (3 RT/ 9LT)
What is the sonographic appearance of the rete testis? Are they easy to identify
- Decreased echogenicity at mediastinum or tiny cystic areas
- Difficult to identify normally
What is the sonographic appearance of the epididymis? 2
- Isoechoic or slightly hyperechoic to the testicle
- Slightly coarser
For scrotal pathology how close to ______% sensitivity in detecting intrascrotal masses
100%
For Scrotal pathology, extratesticular masses are what?
Benign
For intratesticualr masses scrotal pathology is what?
Malignant
What is cryptorchidism? Where is it common?
- Undescended testicle
- Higher incidence in premature infants
What is the most common Genital urinary abnormality in children?
Cryptorchidism
Cryptorchidism typically causes the testes to be affected unilaterally or bilaterally?
Unilateral
Majority or cryptorchidism is located where?
80% located in inguinal canal and palpable
What is gubernaculum?
The structure that guides and anchors the testis during descent into the scrotal sac
What three factors can interrupt the descent of testes?
- Deficiency of gonadotropin normal stimulation
- Adhesions or anatomical maldevelopment
- Idiopathic
What are some complications of Undescended testes? 2
- Infertility
- 48x risk of testicular cancer
What is the treatment of Undescended testes? 2 (adults and children)
- Orchiopexy (children)
- Orchiectomy (adults)
What is does Undescended testes look like sonographically? 5
- Oval or elongated mass (most likely in the inguinal canal)
- Smaller, less echogenic than normal
- Homogenous
- Mediastinum difficulty to identify
- Large lymph node»_space;> Mistaken for testicle
What are some testicular congenital anomalies? 3
- Polyorchidism
- Anorchia
- Testicular ectopia
What is polyorchidism?
Testicular duplication
What is anorchia? Where is it more common?
Absence, more common on left
What is testicular ectopia?
Testicular tissue located anywhere along path of descent
What is it hydrocele? Where do we usually see it?
- Collection of fluid between the tunica vaginalis layers (>2mm)
- Anterolateral scrotum
Is hydrocele congenital or acquired?
Both
What is the most common cause of painless scrotal swelling?
Hydrocele
What is the most common congenital scrotal pathology? When does it normally resolve itself? 2
- Patent processes vaginalis
- Usually resolves by 18 months
What are acquired scrotal pathology causes? 3
- Idiopathic (most common)
- Infection, infarction, neoplasm
- Trauma (25%)
Large hydrocele rarely associated with what?
Neoplasms
Small hydrocele are seen in ______ of patients with what?
- 60%
- Testicular tumours
Is a hydrocele malignant or benign?
Benign Pathology
What is a hematocele? What does it look like? 4
- Blood in the scrotal sac
- Thick scortal wall
- Anechoic > variable
- Septations, debris
What is a pyocele?
Pus in the scrotal sac
What does pyocele look like sonographically? 4
- Echogenic
- Septations/ loculation
- Thick scrotal wall
- Focal mural calcifications
What is a varicocele?
Dilated veins in the pampiniform plexus (>2mm)
How does varicoceles happen? Typically on which side?
- Obstructed venous return
- Typically occur on the left side
What is the primary cause of varicocele? Who is affected? Can we correct it?? Why does it happen?
- Idiopathic
- 15-25 years of age
- Correctable infertility
- Incompetent valves in spermatic vein
What are some secondary causes of varicocele? What should we look for? What is it called sometimes?
- Pressure on spermatic veins
- Look for mass
- “Nutcracker” syndrome
What should doing the valsalva do to a varicocele when the patient standing? 2
- Should increase the size of the veins
- Primary will return to normal in supine
Does the patient position change the appearance of secondary varicoceles?
Does not!
How do we demonstrate change in varicocele?
Valsalva
What does the varicocele look like sonographically? 3
- Multiple anechoic structures >2mm
- At superior pole/ epididymis head
- Color flow