Imaging and revision Flashcards
what level does the renal arteries come off the aorta
L2 (above gonadal)
what level do the gonadal arteries come off the aorta
L2 (below renal)
what level does the coeliac trunk and SMA come off the aorta
L1
what level does the IMA come off the aorta
L3
what level does the abdominal aorta bifurcate
L4
what level are the renal hilums at
left L1
right L1/2
what are the contents of the renal hilum
posterior- renal pelvis
middle- renal artery
anterior- renal vein
lymphatic
nerves
renal sinus fat
which renal vein is longer
the left- passes across the aorta anteriorly to join the right sided IVC
what is USS good at detecting in the kidneys
renal size cortical scarring distention calculi abnormalities
what is CT good at showing in the kidneys
vascular assessment
most pathologies
what are the negatives of CT
high dose radiation
contrast induced nephropathy (rise is serum creatinine and urea 3 days after exposure)
is CT with/ without contrast best to detect calculi
without
are the kidneys bound by mesentery
no are retoperitoneum
how can you reduce the risk of CT induced nephropathy
hydration
eGFR<60
what is MRI good at showing in the kidneys
renal lesions
vascular assessment
most pathologies
what are the negatives of MRI
nephrogenic systemic fibrosis (initial skin erythema, pruritis, pain, later involves other organs, with time skin thickens)
what are the subdivision of the ureter
abdominal, plevic and intravesicle
where do the ureters narrow
pelviureteric junction (renal pelvis and ureter) pelvic brim(crosses over the common iliac artery bifurcation0 anterior and medial to SI joint) vesicoureteric junction (enters bladder)
what muscle does the abdominal ureter follow
medial aspect of the psoas
where does the pelvic ureter turn medially
the level of the ischial spines
what part of the bladder does the ureters enter
the posterolateral angles
what ureter abnormalities can you get
bidif
duplex (two into bladder)
ectopic ureter
retrocaval ureter (behind IVC)
what is the workhorse for assessing the collecting system, ureter and bladder
CT urogram
what is the posterior wall of the bladder loosely attached to in females
anterior vagina and cervix
do you need a full/empty bladder to assess outline w/ USS
full
what can USS of the bladder detect
diverticula, wall irregularities, internal calculi, outline and volumetric measurement
what is cystography good for
(been replaced by CT urogram) leak through bladder tear internal calculi wall irregularities diverticula
what is the gold standard for local bladder tumour staging
MRI
where in bladder does the urethra originate
antero-inferior wall of bladder
what are the subdivisions of the male urethera
prostatic
membranous
bulbous
penile
what is a urethrogram and what is it used for
retrograde filling of urethra
strictures
trauma
diverticula
what is the primary imaging choice for testes, scrotum, uterus, ovaries and prostate
USS
what is a hysterosalpingogram used for
infertility- tubal patency
uterine anomalies
what is an MRI used to image in the genitalia
prostate cancer (local staging) abnormalities not characterisable by USS
what usually causes renal colic
ureteric calculus
what else can stimulate renal colic
pyelonephritis (do USS to exclude ureteric obstruction) or gynaecological disease (do USS to visualise pathology)
what investigations into colic if the patient is pregnant
USS/ MRI
what tests can detect real calculi
KUB x ray (only shows dense minority- not sensitive or specific as other causes of calcification), CT and MRI
(calculi are usually calcium dense)
what is the definitive test to confirm a symptomatic ureteric calculus
non contrast enhanced CT (shows nearly all regardless of size or calcium content)
also shows signs of obstruction (perinephric stranding, hydroureteronephrosis)
what happens to most calculi
are passed spontaneously
what can cause macroscopic haematuria
calculi infection tumour (renal cell carcinoma, transitional cell carcinoma) urethritis/ prostatitis trauma clotting disorders
what investigation into haematuria in over 50s
ct urography (kidneys, collecting systems and ureters) cytoscopy (bladder and urethra)
ureteroscopy (tumours)
what is the most sensitive way of detecting renal parenchymal tumours, urothelial tumours of the collecting systems or ureters
second CTU following contrast
what investigations for haematuria in under 50s
incidence low so not CTU
USS of kidneys for calculi and renal parenchymal tumours
cystoscopy for bladder TCC, caclui or tumours/ evidence of urethritis or prostatitis
CTU only when US and cytoscopy normal and haematuria persists
when is MR urography used
when CTU contraindication (contrast allergy, renal impairment, pregnancy)
why are renal masses <3cm followed up not operated on
as very rarely metastasise
what are renal masses containing fat
benign angiomyolipomas
what are fluid dense renal masses
cysts
uniform cysts are benign
what renal cysts are malignant
complex cysts containing solid areas/ thick septa
are solid renal masses >3cm often benign/malignant
malignant
what features of a renal mass can MR detect
size, presence of fat/fluid, internal architecture
what is used for renal tumour staging
CT
- local extent
- modal disease
- metastatic disease
what mets do you get in the lung form renal tumours
cannonball mets
what are the types of renal impairement
pre renal (dehydration, hypotension, renal artery stenosis) renal (parenchymal disease, drugs, toxins) post- renal (obstruction)
what is used to detect renal artery stenosis
MR
what is used to detect renal disease
USS to guide biopsy
what often accompanies obstruction
hydronephrosis
what is epididymo-orchitis
inflammation of the epididymis and/or testes caused by virus/ bacteria
can be complicated by abscess formation/ ischaemia
what test for epididymo-orchitis
usually hypervascular on US
who gets testicular torsion
young males
what test for torsion
usually avascular or US
what are causes of a painless scrotum swelling
hernia, variocoele, hydrocoele, epididymal cyst testicular tumour (rare)
what is a variocoele
dilated scrotal venous plexus
what is a hydrocoele
when (black anechoic on USS) fluid surround the testes
what is a testicular seminoma
intra testicular soft tissue mass
what is the best imaging for ureteric/ renal injury
CT
what type of bladder rupture needs surgery
intraperitoneal (extra peritoneal more common and treated conservatively)
how is bladder rupture diagnosed
cystography/ CT cystography (contrast leaks through tear)
when do you not catheterise
in urethral injury (meatal blleding, cant pass urine) (call urologists)
what relieve ureteric obstruction
nephrostomy
what is the definitive test for scrotal disease
USS