Articles
Articles are a collaborative effort to provide a single canonical page on all topics relevant to the practice of radiology. As such, articles are written and edited by countless contributing members over a period of time. A global group of dedicated editors oversee accuracy, consulting with expert advisers, and constantly reviewing additions.
981 results found
Article
Metanephric blastema
Metanephric blastema (or metanephrogenic blastema) is one of the two embryological structure that gives rise to the kidney, the other one being the ureteric bud.
Related pathology
Persistent metanephric blastemas after 36 weeks of gestational age are called nephrogenic rests. They are associat...
Article
Metaplasia
Metaplasia is a general pathology term that refers to process when one cell type is replaced by another. It usually occurs in the context of a changed cellular environment to which the new cell type is better adapted 1. Examples include 2-5:
Barrett esophagus: normal squamous epithelium replace...
Article
Metastases to testis
Metastases to testis are a very rare cause of a testicular mass and may be bilateral in up to 15% of patients.
Epidemiology
Metastases to the testes are apparent in ~0.04% of autopsy studies in patients with known malignancy. The average age is 57 years, much older than the primary age for pr...
Article
Microlithiasis (disambiguation)
Microlithiasis (rare plural: microlithiases) merely means very small stones and may refer to:
alveolar microlithiasis
biliary microlithiasis
calyceal microlithiasis
testicular microlithiasis
Article
Middle adrenal artery
The middle adrenal (suprarenal) artery is one of the three adrenal arteries that supply the adrenal gland.
Gross Anatomy
Origin
The middle suprarenal arteries arise from the aorta on each side between the inferior phrenic artery and the renal artery. They run laterally across the diaphragmati...
Article
Milk-alkali syndrome
Milk-alkali syndrome is the combination of:
hypercalcemia
renal failure
metabolic alkalosis
It is due to a large amount of calcium and alkali being ingested (e.g. milk and antacids for peptic ulcer disease treatment or calcium carbonate for osteoporosis). It is a cause of medullary nephrocal...
Article
Milk of calcium (disambiguation)
The term milk of calcium (MOC) is given to dependent, sedimented calcification within a cystic structure or hollow organ. This sort of colloidal calcium suspension layering can occur in various regions:
renal: milk of calcium in renal cyst (most common)
ureter: milk of calcium in the ureter 7
...
Article
Mixed gonadal dysgenesis
Mixed gonadal dysgenesis (MGD) is a type of gonadal dysgenesis characterized by gonadal asymmetry, and/or sex chromosomal mosaicism, as well as retained Müllerian ducts.
Pathology
Depending on the chromosomal composition, patients may have testes and/or streak gonads.
Genetics
affected indiv...
Article
Mixed epithelial and stromal tumor
Mixed epithelial and stromal tumors (MEST) are a family of uncommon renal neoplasms in adults in a spectrum ranging from predominantly cystic (adult cystic nephroma) to more solid tumors.
Epidemiology
There is a female preponderance 10:1 1 with tumors occurring predominantly in middle-aged pe...
Article
Molar tooth sign (abdomen)
The abdominal molar tooth sign refers to the appearance of contrast media which has spilled out of the urinary bladder on CT cystography after extraperitoneal bladder rupture.
Contrast flows out of the ruptured bladder, occupying the preperitoneal cavum Retzii and surrounds the bladder in the s...
Article
Molar tooth sign (disambiguation)
The molar tooth sign may refer to:
molar tooth sign (CNS)
molar tooth sign (abdomen)
Article
Mondor disease
Mondor disease is a rare benign breast condition characterized by thrombophlebitis of the subcutaneous veins of the breast and anterior chest wall. It can also occur in the dorsal veins of the penis.
Epidemiology
Although Mondor disease is rarely reported in the literature, this is likely in p...
Article
Mons pubis
The mons pubis (plural: montes pubis) refers to the rounded protuberant skin-covered soft tissue overlying the symphysis pubis (in both sexes). It is most prominent in adult females.
In females it forms the most superior part of the vulva and it is also called the mons Veneris (plural: montes V...
Article
Moth eaten calyces
Moth eaten calyx refers to the ragged, feathery calyceal outline due to irregular erosions of the calyx. It is one of the earliest excretory urographic appearance of genitourinary tuberculosis.
Pathology
This appearance is due to necrotizing papillitis, which may further progress to form medu...
Article
MR defecating proctography
MR defecating proctography is a dynamic study for evaluation of the pelvic floor and pelvic organ prolapse.
Phases
There are four phases of evaluation:
rest
squeeze
strain (Valsalva)
defecation/evacuation
Method of evaluation
Many variations in the techniques described below exist.
Pati...
Article
MRI targeted prostate biopsy
MRI targeted prostate biopsy refers to an imaging targeted technique rather than the traditional systematic approach of a prostate biopsy after respective imaging with multiparametric MRI (mpMRI) of the prostate.
As a consequence of the recent advances of multiparametric MRI (mpMRI) of the pros...
Article
MR spectroscopy in prostate cancer
MR spectroscopy is a promising development in the radiological evaluation of possible prostate malignancy.
The MR spectroscopic evaluation is mainly based on the choline peak elevation and choline-creatinine ratios.
Choline/creatine to citrate ratios:
> 0.5: suspicious
> 0.8: very suspiciou...
Article
Mulberry stone
A mulberry stone is one of the types of urinary tract stones. It is formed of calcium oxalate dihydrate. It can be considered as a subset of a jackstone calculus which has a spiked appearance. When the stone has less well-developed spikes, it may appear to have a mamillated appearance, hence it ...
Article
Müllerian duct cyst
A Müllerian duct cyst is a cyst that arises from remnants of the Müllerian duct and is one of the midline cystic masses in the male pelvis.
Epidemiology
Müllerian duct cysts usually occur in the 3rd and 4th decades of life (whereas prostatic utricle cysts are most often detected in the 1st an...
Article
Multicystic dysplastic kidney
Multicystic dysplastic kidney (MCDK) is a type of non-heritable pediatric cystic renal disease. It results in multiple cysts being formed in utero in the affected kidney.
Epidemiology
Unilateral incidence is estimated at 1:2500-4000. There may be a predisposition for the left kidney, a slightl...
Article
Multicystic mesothelioma
Multicystic mesotheliomas are a rare benign subtype of mesothelioma.
Terminology
The nomenclature for this condition can be confusing due to the use of multiple interchangeable different synonyms that put it together with the peritoneal inclusion cysts. Although there is still some debate on ...
Article
Multilocular cystic renal neoplasm of low malignant potential
Multilocular cystic renal neoplasm of low malignant potential is a low-grade adult renal tumor composed entirely of numerous cysts. The entity was previously known as multilocular cystic renal cell carcinoma, which usually had clear cell morphology, but was redefined in the 2016 WHO classificati...
Article
Multiple endocrine neoplasia syndromes
Multiple endocrine neoplasia (MEN) syndromes are a collection of syndromes characterized by the presence of, as the name would suggest, multiple endocrine tumors. They are autosomal dominant in inheritance.
MEN1 (Wermer syndrome)
MEN2 (multiple endocrine adenomatosis)
MEN2a (Sipple syndrome)
...
Article
Multiple endocrine neoplasia type II
Multiple endocrine neoplasia type II (MEN2) is also known as mucosal neuroma syndrome or multiple endocrine adenomatosis. It is a collection of syndromes characterized by the presence of multiple endocrine tumors.
They are autosomal dominant in inheritance, and share medullary thyroid carcinom...
Article
Multiple endocrine neoplasia type IIb
Multiple endocrine neoplasia (MEN) type IIb, also known as MEN type 3 (MEN3) 3 or mucosal neuroma syndrome 2, accounts for only 5% cases of MEN2 and is characterized by:
pheochromocytoma(s): in 50% of patients, often bilateral, and can be extra-adrenal
medullary thyroid cancer: 100% of patient...
Article
Multiple filling defects of the ureter (differential)
Multiple filling defects within a ureter, as seen on conventional IVU or CT IVU, have a relatively small differential including:
spreading or multifocal transitional cell carcinoma (TCC)
vascular indentations
multiple ureteral stones (steinstrasse)
blood clots
ureteritis cystica
Stevens-Jo...
Article
Multiple filling defects of ureter (mnemonic)
Multiple filling defects within a ureter, as seen on conventional IVU or CT IVU, have a relatively small differential which can be learned using this mnemonic:
CUT SLIM
Mnemonic
C: clots
U: ureteritis cystica
T: transitional cell carcinoma (TCC)
S: stones, Stevens-Johnson syndrome
L: l...
Article
Mumps
Mumps is a (usually) self-limited viral infection that often occurs in epidemics among children. Its incidence has markedly diminished in countries with childhood vaccination programs, but may still be seen in adult patients who have not received vaccinations or who have waning immunity. It may ...
Article
Musculus compressor nuda
Musculus compressor nuda is a small striated musculotendinous sling of the bulbocavernosus muscle, which extends from the anterior and lateral surfaces of the proximal bulbous urethra.
Musculus compressor nuda causes the proximal bulbous urethra to form a symmetric convex cone shape where the t...
Article
N-acetylcysteine
N-acetylcysteine (NAC) if often used as a prophylaxis against contrast-induced nephropathy. Protocols for administration vary widely from institution to institution and the true efficacy is still controversial.
A typical protocol is [1-2]:
600 mg acetylcysteine twice daily on the day of the ex...
Article
Neonatal hydronephrosis
Neonatal hydronephrosis is most commonly diagnosed antenatally as fetal pylectasis, and in the majority of cases is due to pelvi-ureteric junction (PUJ) obstruction.
Pathology
Etiology
pelvi-ureteric junction (PUJ) obstruction (50% of cases 1,6)
vesicoureteric reflux (~20% of cases 5)
pos...
Article
Nephroblastomatosis
Nephroblastomatosis refers to diffuse or multifocal involvement of the kidneys with nephrogenic rests (persistent metanephric blastema).
Epidemiology
Nephrogenic rests are found incidentally in 1% of infants.
Pathology
Nephrogenic rests are foci of metanephric blastema that persist beyond 36...
Article
Nephrocalcinosis
Nephrocalcinosis, previous known as Anderson-Carr kidney or Albright calcinosis, refers to the deposition of calcium salts in the parenchyma of the kidney. It is divided into several types, with differing etiologies, based on the distribution:
medullary nephrocalcinosis: 95%
cortical nephrocal...
Article
Nephrogenic systemic fibrosis
Nephrogenic systemic fibrosis (NSF), also known as nephrogenic fibrosing dermopathy, is a complication of gadolinium-based contrast agents used in MRI.
It is characterized by "firm, erythematous, and indurated plaques of the skin associated with subcutaneous edema" 1. Eventually, flexure contra...
Article
Nephroptosis
Nephroptosis, also known as floating/wandering kidney or ren mobilis, refers to the descent of the kidney more than 5 cm or two vertebral bodies when the patient moves from a supine to upright position during IVU 1,2.
Displacement can also occur medially across the midline, so-called medial nep...
Article
Nephrostomy
Nephrostomy is a common urologic or interventional radiology procedure in which a tube/catheter is introduced into the renal collecting system (usually the renal pelvis).
Nephrostomies can either be
"open" nephrostomy: after a urological surgical procedure, such as a UPJ stone removal
these t...
Article
Nephrotic syndrome
Nephrotic syndrome results from loss of plasma proteins in the urine and characterized by hypoalbuminemia, hyperalbuminuria, hyperlipidemia, and edema. It may be caused by primary (idiopathic) renal disease or by a variety of secondary causes.
Clinical presentation
Patients present with marked...
Article
Neuroblastoma
Neuroblastomas are tumors of neuroblastic origin. Although they may occur anywhere along the sympathetic chain, the vast majority arise from the adrenal gland.
They represent the most common extracranial solid childhood malignancy and are the third commonest childhood tumor after leukemia and b...
Article
Neuroblastoma (staging)
There are two methods of neuroblastoma staging, one that is based on post-operative patients (INSS) and one developed for pre-treatment patients (INRGSS).
Staging
International Neuroblastoma Staging System (INSS)
This staging system is for post-operative patients and mainly for prognosis 1:
...
Article
Neuroblastoma vs Wilms tumor
Both neuroblastoma and Wilms tumor occur in early childhood and typically present as large abdominal masses closely related to the kidneys. Distinguishing between the two is important, and a number of features are helpful.
Neuroblastoma
calcification very common: 90%
encases vascular structur...
Article
Neurocristopathy syndromes
Neurocristopathy syndromes encompasses a group of conditions united by abnormal migration, differentiation, division or survival of neural crest cells 1.
Examples include:
Waardenburg-Shah syndrome
Haddad syndrome
MEN IIa
neurofibromatosis type I (NF1)
Sturge-Weber syndrome
Bamforth-Lazar...
Article
Neurogenic bladder
Neurogenic bladder is a term applied to a dysfunctional urinary bladder that results from an injury to the central or peripheral nerves that control and regulate urination. Injury to the brain, brainstem, spinal cord or peripheral nerves from various causes including infection, trauma, malignanc...
Article
Non-seminomatous germ cell tumors
Non-seminomatous germ cell tumors (NSGCTs) are one of the main groups of germ cell tumors (the other being seminoma). Although they are made up of distinct histological entities, in general, they have similar radiographic appearances. They can, however, be found widely in the body, with variable...
Article
Normal genitourinary tract imaging examples
This article lists examples of normal imaging of the genitourinary tract and surrounding structures, divided by modality.
Kidneys
Plain radiograph
KUB: example 1
abdominal x-ray: example 1
Intravenous Urogram (IVU) and Intravenous Pyelogram (IVP)
IVU: example 1, example 2
Ultrasound
rena...
Article
Normal kidney size in adults
Normal kidney size in adults varies with the height of the individual. Also, in general, it decreases with age and increases with body mass index (BMI).
The size of the kidneys is measured mainly sonographically, although both CT and MRI scans also can be used to estimate renal size.
The mean ...
Article
Normal kidney size in children
The normal size of kidneys in children will naturally depend on the age and size of the child. Based on the children's ages normal average renal length on ultrasound are as follows:
0 to 2 months: 5 cm (approximately 2 inches)
2 months to 6 months: 5.7 cm
6 months to 1 year: 6.2 cm (2.5 inche...
Article
Nutcracker phenomenon
The nutcracker phenomenon, also known as nutcracker anatomy or left renal vein entrapment, refers to the anatomic or pathophysiologic entity wherein the superior mesenteric artery compresses and impedes outflow of the left renal vein into the inferior vena cava. It can be a common incidental fin...
Article
Nutcracker syndrome
Nutcracker syndrome is a vascular compression disorder that refers to the compression of the left renal vein most commonly between the superior mesenteric artery (SMA) and aorta, although other variations can exist 1. This can lead to renal venous hypertension, resulting in rupture of thin-walle...
Article
Obstructive cystic renal dysplasia
Obstructive cystic renal dysplasia, or Potter type IV cystic renal disease, is a potential complication that can occur from prolonged obstruction of the bladder outlet or urethra during gestation.
Pathology
Ureteric obstruction during active nephrogenesis results in cystic renal dysplasia; th...
Article
Obstructive uropathy
An obstructive uropathy is a catch-all term encompassing any cause of complete or partial, congenital or acquired, and permanent or intermittent obstruction of the urinary tract. Depending on the severity of obstruction and extent, it may result in permanent change in both the collecting system ...
Article
Oncocalyx
An oncocalyx is a dilated tumor filled renal calyx, typically seen in patients with transitional cell carcinomas of the renal pelvis.
Article
Orchitis
Orchitis (plural: orchitides) is an infection of the testicle, which is rarely isolated, and when in conjunction with the epididymis is called epididymo-orchitis.
Pathology
Usually, bacteria retrogradely seed into the testis from the bladder or prostate. It can also be secondary to viral infec...
Article
Ossifying renal tumor of infancy
Ossifying renal tumor of infancy (ORTI) is a rare renal tumor.
Epidemiology
extremely rare, <<1% of pediatric renal neoplasms (17 cases reported)
6 days - 3 months
male predominant
Pathology
Histology reveals spindle cells and osteoblastic cells in a calcified osteoid matrix. It is thought...
Article
Ovarian vein syndrome
Ovarian vein syndrome is a relatively rare condition where a dilated ovarian vein (ovarian venous varix) causes notching, dilatation, or obstruction of the ureter. This is usually secondary to varicosities of the ovarian vein or ovarian vein thrombosis and occurs at the point where the ovarian v...
Article
Oxalosis
Oxalosis is supersaturation of calcium oxalate in the urine (hyperoxaluria), which in turn results in nephrolithiasis and cortical nephrocalcinosis.
This article focus on the secondary oxalosis, please refer to primary oxalosis for a specific discussion on this entity.
Pathology
Calcium oxa...
Article
Pediatric cystic renal diseases
The pediatric cystic renal diseases are a heterogeneous group of conditions defined by the presence of kidney cysts due to hereditary or non-hereditary causes:
isolated simple cyst
cystic renal dysplasia
multicystic dysplastic kidney (MCDK)
obstructive cystic renal dysplasia
genetic disorde...
Article
Pediatric kidney size
The pediatric kidneys follow a growth curve. The measurements below are of the longest maximal dimension. Measurements in parentheses are one standard deviation.
0 months 1: female: 4.15 cm (0.35); male: 4.22 cm (0.32)
2 months: 5.28 cm (0.66)
6 months: 6.15 cm (0.67)
10 months: 6.23 cm (0....
Article
Pediatric renal tumors and masses
Pediatric renal tumors and masses are another group of diseases (just like cystic renal diseases in both the adult and child) that are bewildering in their number, nomenclature and overlapping findings.
Commoner lesions
Wilms tumor: common in older children 1-8 years old
nephroblastomatosis: ...
Article
Pediatric urinary tract infection
Pediatric urinary tract infections are common and are a source of significant imaging in young children.
Epidemiology
Pediatric urinary tract infections affect up to 2.8% of all children every year, with approximately 2% of boys and 8% or more of girls developing a urinary tract infection at s...
Article
Pediatric urinary tract infection (NICE guideline)
The British National Institute for Health and Care Excellence (NICE) published the “Urinary tract infection in under 16s: diagnosis and management” in 2007 as a guideline for pediatric urinary tract infection (UTI) management, including imaging, prophylaxis and follow-up 1.
This article intend...
Article
Page kidney
Page kidney, or Page phenomenon, refers to systemic hypertension secondary to extrinsic compression of the kidney by a subcapsular collection, e.g. hematoma, seroma, or urinoma.
Clinical presentation
Patients present with hypertension, which may be recognized acutely after an inciting event or...
Article
Paintbrush appearance
A paintbrush appearance describes the streaky appearances of dilated contrast filled tubules within the renal medulla on IVP or CT-IVU. This appearance is characteristic for medullary sponge kidneys.
A similar appearance is also seen in the renal tubular ectasia; though less pronounced.
See al...
Article
Pampiniform plexus
The pampiniform plexus (plural: plexuses) is the venous network of approximately 10 veins draining the testis and epididymis. The network surrounds the testicular artery in the spermatic cord and lies anterior to the ductus deferens. Each network coalesces to form the testicular (internal sperma...
Article
Pancake kidney
Pancake kidney (also known as discoid kidney, disc kidney, lump kidney, fused pelvic kidney or cake kidney) is a rare renal fusion anomaly of the kidneys of the crossed fused variety.
Clinical presentation
Pancake kidney may be an incidental finding. However, they can present clinically becaus...
Article
Papillary cystadenoma of the epididymis
Papillary cystadenomas of the epididymis are the second most common benign tumors of the epididymis after adenomatoid tumors and are common in patients with von Hippel-Lindau disease (vHL).
Clinical presentation
Papillary cystadenomas are usually asymptomatic.
Epidemiology
They are more comm...
Article
Papillary renal cell carcinoma
Papillary renal cell carcinomas (pRCC) are the second most common histological subtype of renal cell carcinoma.
Epidemiology
This subtype may account 13-20% of all renal cell cancer 1. There is slightly increased male predilection.
Clinical presentation
As with other types of renal cell canc...
Article
Pararectal space
The pararectal spaces are paired, triangular-shaped spaces in the posterior pelvis.
Gross anatomy
Boundaries
anterior: cardinal ligament
medial: rectal pillars
lateral: levator ani muscle, internal iliac arteries
posterior: sacrum
Contents
fat
connective tissue
Relations
separated fr...
Article
Parasympathetic pelvic splanchnic nerves
The pelvic splanchnic nerves also known as nervi erigentes are preganglionic (presynaptic) parasympathetic nerve fibers that arise from S2, S3 and S4 nerve roots of the sacral plexus. These nerves form the parasympathetic portion of the autonomic nervous system in the pelvis.
Gross anatomy
O...
Article
Paratesticular lesions
Paratesticular lesions have a long list of differential diagnoses:
neoplastic
benign
epididymal cyst (most common epididymal mass)
scrotal tunica cysts
tunica vaginalis cyst
tunica albuginea cyst
spermatic cord lipoma
scrotal hemangioma: is often hypervascular on color Doppler, unlike ot...
Article
Paratesticular tumors
A paratesticular mass may derive from a number of structures that surround the testicle within the scrotum; most commonly, they derive from the spermatic cord.
Pathology
The masses can be categorized as benign (70%) or malignant (30%).
Etiology
Benign
spermatic cord lipoma (most common par...
Article
Paraurethral duct
The paraurethral ducts (or Skene ducts) drain the paraurethral glands of the female urethra. There is one duct, draining each gland, on each side, just proximal to the external urethral meatus.
History and etymology
Skene ducts are named after the Scottish-American gynecologist Alexander John...
Article
Paraurethral duct cyst
Paraurethral duct cysts are retention cysts that form secondary to inflammatory obstruction of the paraurethral (Skene) ducts in females.
Pathology
The cysts are lined by stratified squamous epithelium due to their origin from the urogenital sinus.
Clinical presentation
Usually asymptomatic....
Article
Paraurethral glands
Paraurethral glands (or Skene glands) lie within the wall of the distal female urethra and secrete mucus during sexual activity. Each gland is drained by a single paraurethral (Skene) duct. They are homologous to the male prostate gland.
If the paraurethral duct becomes obstructed (inflammation...
Article
Paravesical space
The paravesical spaces are paired avascular spaces of the pelvis. The paravesical spaces generally contain fat, but can become filled with ascites, blood, or other substances during pathological processes.
Gross anatomy
Boundaries
superior: lateral umbilical folds
inferior: pubocervical fasc...
Article
Patent urachus
A patent urachus is one of the spectrum of congenital urachal anomalies. It has occasionally been termed "urachal fistula".
Clinical presentation
A patent urachus is often diagnosed in neonates when urine is noted leaking from the umbilicus. The umbilicus may also have an abnormal appearance o...
Article
Pear-shaped bladder
Pear-shaped (or teardrop-shaped) bladder is one whose normal round or ovoid shape has been extrinsically compressed to resemble a pear. The pear may be inverted or upright, depending on how the excess pelvic tissue compresses the bladder.
Pathology
Etiology
Causes of a pear-shaped bladder inc...
Article
Pelvic abscess
A pelvic abscess refers to a walled-off collection of pus in the pelvis.
Pathology
Etiology
Some of the causes include:
pelvic inflammatory disease (tubo-ovarian abscess)
iatrogenic e.g. post-surgical
inflammatory bowel disease
pelvic actinomycosis infection
diverticulitis
Clinical pre...
Article
Pelvic congestion syndrome
Pelvic congestion syndrome (some prefer pelvic venous insufficiency 9) is a condition that results from retrograde flow through incompetent valves in ovarian veins. It is a commonly missed and potentially-treatable cause of chronic abdominopelvic pain.
Epidemiology
It tends to be more common ...
Article
Pelvic kidney
Pelvic kidney (sometimes known as sacral kidney) is a kidney that is fixed in the bony pelvis or across the spine, and is an anatomic variant 1.
Epidemiology
Pelvic ectopia is seen in 1 in 2,100-3,000 autopsies. It is considered the most common form of renal ectopia 4.
Associations
Ectopic k...
Article
Pelvic lipomatosis
Pelvic lipomatosis or pelvic fibrolipomatosis represents excessive deposition of fat in pelvis due to overgrowth of adipose cells leading to compression of pelvic organs.
Epidemiology
The condition usually presents in patients 20-50 years of age. The condition is predominantly (~66% of cases) ...
Article
Pelvic peritoneal space
The pelvic peritoneal space is the inferior reflection of the peritoneum over the fundus of the urinary bladder and the front of the rectum at the junction of its middle and lower thirds. In females, the reflection is also over the anterior and posterior surface of the uterus and the upper poste...
Article
Pelviureteric junction obstruction
Pelviureteric junction (PUJ) obstruction/stenosis, also known as ureteropelvic junction (UPJ) obstruction/stenosis, can be one of the causes of obstructive uropathy. It can be congenital or acquired with a congenital pelviureteric junction obstruction being one of the commonest causes of antenat...
Article
Penile fracture
Penile fracture or rupture is a rare event, however, requires emergency diagnosis and intervention. It is a rupture of penile tunica albuginea of the corpora cavernosa or spongiosum caused by trauma to an erect penis, most commonly during sexual intercourse. The urologist needs to know whether t...
Article
Penile fracture grading
A simple grading system for penile fracture has been developed but it is not widely used or validated nor recognized by relevant urological surgical societies. Regardless, this system which relies on ultrasound assessment of the tunica albugenia, corpora of the penis, urethra and other fascia 1 ...
Article
Penile implant
Penile implants are a surgically placed device to assist with erectile dysfunction. The device has inflatable components inserted in the penile shaft with a reservoir typically placed in the pelvis.
See also
erectile dysfunction
Penile Doppler in erectile dysfunction
medical devices in the a...
Article
Penis
The penis (plural: penises or, rarely, penes) is the external midline urinary and reproductive structure of the male urogenital system.
Gross anatomy
The gross anatomy of the penis can be divided into five sections:
Skin
loosely connected to the tunica albuginea
distally folded to form the...
Article
Percutaenous renal tumor ablation
Percutaneous ablation in the kidney is now performed as a standard therapeutic nephron-sparing option in patients who are poor candidates for resection. It can either be a radiofrequency ablation or a cryoablation.
Follow up time frame
Can vary according to center but usually includes contrast...
Article
Percutaneous nephrolithotomy
Percutaneous nephrolithotomy (PCNL) is a surgical procedure for the extraction of large renal calculi. It is usually performed in the operating theater either by a urologist or combined urologist-radiologist team.
Indication
PCNL is used to destroy and remove renal calculi, typically over 2 cm...
Article
Percutaneous nephrostomy
Percutaneous nephrostomy is a technique in which percutaneous access to the kidney is achieved under radiological guidance. The access is then often maintained with the use of an indwelling catheter.
Indications
Percutaneous nephrostomy is usually reserved for when retrograde approaches are un...
Article
Percutaneous nephrostomy salvage and tube exchange
Percutaenous nephrostomy salvage and tube exchange are two procedures undertaken in those with long term nephrostomies. These patients are often either unsuitable or do not wish to have ureteric stenting to relieve their urinary tract obstruction.
Nephrostomy salvage
Nephrostomy salvage is und...
Article
Percutaneous renal biopsy
Percutaneous renal biopsy, utilizing either ultrasound or CT, allows for an accurate, reliable method of acquiring renal tissue for histopathological assessment.
The biopsy may be of a native or transplant kidney. It is divided into two types:
non-focal or non-targeted
focal or targeted (i.e....
Article
Perineal body
The perineal body, also known as the central tendon of the perineum, (TA: corpus perineale) is a key midline fibromuscular structure, with important muscular attachments, which acts to stabilize the structures of the pelvis and perineum. It is located between the anal canal and the bulb of the p...
Article
Perineal membrane
The perineal membrane is a thin triangular horizontal layer of dense tough fascia in the perineum which divides the urogenital triangle into superficial (inferior) and deep (superior) perineal pouches.
It attaches to the inferior margins of the ischiopubic rami, enclosing the anterior portion o...