Imaging Flashcards
how many nephrons per kidney?
approx 1 million
Vascular variants at the hilum of kidney
- Superior pole accessory renal artery
- Early branching of renal artery
Strengths of US for kidneys:
Renal size cortical scarring doppler distenstion of pelvicalyceal system calculi detection of renal abnormalities cheap
weaknesses of US for kidneys
User dependent
Limited characterisation of focal lesions
No contrast medium
Strengths of CT for kidneys
Quick Multi-phasic assessment of kidney Vascular assessment Most pathologies characterised High spatial resolution Multiplanar imaging possible
Weaknesses of CT for kidneys
High dose ionising radiation
Contrast induced Nephropathy
CT phase best to depict calculi
pre-contrast
CT phase best for cortical (cortex) enhancement
corticomedullary
CT phase best for renal medulla and cortex
Nephrographic
CT phase best for opacification of renal collecting system and ureters
Excretory
Strengths of MRI for kidneys
Excellent tissue contrast resolution
Renal lesion characterisation
Vascular assessment
Characterises most pathologies
Weaknesses of MRI for kidneys
Lengthy acquisition
Nephrogenic Systemic Fibrosis
Replaced IV urography
CT urogram
Urethrogram
Retrograde filling of urethra
Identifies strictures, trauma, + diverticula
Genitals: US primary imaging for -
Testes/scrotum
Uterus and ovaries
Prostate biopsies
Genitals: Hysterosalpingogram best imaging for:
Infertility - tubal patency
Uterine anomalies
Genitals: MRI best imaging for:
Prostate cancer (local staging) troubleshooting things not characterised in US
In hysterosalpinogram, where does the contrast spill into?
Peritoneum
Investigation for Macroscopic haematuria in over 50s
CT urography (renal parenchymal tumours + urothelial tumours of collecting system or ureters)
Investigation for macroscopic haematuria in under 50s
US of kidneys (calculi or renal parenchymal tumours)
Cystoscopy
CTU (only if recurrent haematuria)
MR Urography useful for people:
- With contrast allergy
- Renal impairment
- Pregnant
Best invx for Urinary tract trauma
CT
Best imaging Renal Colic
Non-contrast CT
Renal masses best imaging
CT for characterisation and staging
Best imaging for pregnant persons
NOT CT
US or MRI
Imaging for scrotal disease
US