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Incoming links: Hydrocele
Abdominal hernias are classified primarily by the opening through which tissue protrudes; groin and scrotal swellings have a substantially wider differential diagnosis. Reducibility, obstruction and strangulation describe the state of a hernia, rather than different anatomical sites.
The principal external varieties are indirect inguinal hernia and direct inguinal hernia, femoral hernia, umbilical hernia and other anterior abdominal-wall hernias, including epigastric hernia and incisional hernia. An indirect inguinal hernia enters through the deep inguinal ring lateral to the inferior epigastric vessels and can follow the canal into the scrotum; a direct inguinal hernia passes through the posterior wall medial to those vessels. A femoral hernia passes through the femoral canal below the inguinal ligament, rather than along the inguinal canal.[ref]
Surgical Mesh Used for Hernia Repair by the FDA. Types of hernia: inguinal, femoral, incisional, ventral, umbilical and hiatal
Less common wall or pelvic varieties include lateral ventral hernia, lumbar hernia, obturator hernia, sciatic hernia and perineal hernia. Diaphragmatic hernia defects allow abdominal contents into the thorax. Internal hernias can pass through a mesenteric or peritoneal aperture while remaining within the abdominal cavity, including paraduodenal recesses or the epiploic foramen. Contents may be intestine, omentum or other viscera; a developmental route and an acquired wall weakness can yield different forms at the same broad site.[ref]
Hernias of the Abdominal Wall by Merck Manual Professional Edition. Anatomical varieties and distinction of inguinal and femoral defects
[ref]Internal Hernias: A Difficult Diagnostic Challenge. Review of CT Signs and Clinical Findings. Classification by aperture and internal location
In the groin, alternatives to an inguinoscrotal hernia include enlarged or inflamed lymph nodes, an abscess, lipoma of the spermatic cord or other soft tissue, a retained or undescended testis, a hydrocele of the cord, a saphena varix, and a femoral aneurysm or pseudoaneurysm. A femoral hernia is also an important separate diagnosis. A fluid collection along a persistent female inguinal peritoneal process can produce a corresponding inguinal swelling. These lesions are not interchangeable merely because they lie near the inguinal opening.[ref]
Inguinal Hernias: Diagnosis and Management by the American Academy of Family Physicians. Differential diagnosis of groin swelling
In the scrotum, consider hydrocele, haematocele, spermatocele or an epididymal cyst, varicocele, epididymitis, orchitis, abscess, traumatic swelling and a testicular tumour. Torsion of the testis or its appendages can cause acute painful swelling. General oedema or lymphoedema can enlarge the scrotal wall diffusely rather than create one discrete lump.[ref]
Painless Scrotal Mass by Merck Manual Professional Edition. Etiology: hydrocele, varicocele, cystic masses, haematocele, oedema and tumour
[ref]The Acute Scrotum by the American Urological Association. Differential diagnosis: torsion, trauma, infection and other acute swelling
The discriminating examination locates the swelling relative to the inguinal ligament and to the testis, asks whether it is cystic or solid, and notes posture-related change, reducibility, cough impulse and transillumination when relevant. A cough impulse is not exclusive to a hernia; a communicating fluid collection or a venous swelling may vary with pressure. Modern ultrasonography, including assessment of blood flow when indicated, can clarify uncertain anatomy. The site and character of a swelling must be established before it is called an inguinoscrotal hernia.
Suspected strangulation means threatened or impaired blood supply to herniated tissue; it is more serious than irreducibility alone and can occur without complete intestinal obstruction. The diagnostic assessment must combine the local swelling, abdominal symptoms, general condition and time course.
Ask about a previous hernia, whether it was reducible, a new painful swelling, abrupt failure of reduction, the onset of pain and vomiting, bowel function and prior attempts at manipulation. Examine the relevant sites, including both groins and the femoral regions, rather than attributing unexplained vomiting and abdominal pain solely to a gastric illness. A previously familiar painless lump can become dangerous after years of intermittent reduction. A small femoral hernia may be less conspicuous than its systemic consequences suggest.
Locally, new tenderness, tension, irreducibility and loss of a usual cough impulse raise concern. Erythematous or discoloured overlying skin is more alarming, but can be absent early. Abdominal distension, persistent vomiting and failure to pass stool or flatus support intestinal obstruction. Increasing pain, tachycardia, fever, dehydration, peritonitis or shock suggest advancing compromise. Do not wait for every late sign: prolonged delay can lead to intestinal ischaemia, necrosis and sepsis.[ref]
WSES guidelines for emergency repair of complicated abdominal wall hernias (2017). Timing of intervention; predictors and consequences of bowel strangulation
Several negative observations are unsafe reassurances. Passage of stool may merely empty bowel below the obstruction. If only part of the bowel wall is trapped, as in a Richter hernia, complete obstruction may never occur. A very ill person may describe less pain late in the course. Disappearance of the external swelling after a forceful manipulation does not prove safe restoration of viable bowel: persistence of pain or obstruction demands reassessment, including possible reduction en masse.[ref]
Management of Incarcerated and Strangulated Abdominal Wall Hernias by the American College of Surgeons. 2021 manual, chapter 23, Richter hernia and diagnostic considerations
An 1866 surgeon relied heavily on these bedside features and on the distinction from an inflamed lymph node, hydrocele, another groin mass or non-strangulated hernia. Contemporary reports describe sequences of attempted reduction, baths, enemata and chloroform before operation. They document period practice; they must not be transferred into a rule that strangulation begins only when repeated reduction has failed.[ref]
Surgical ward clinical report from the Royal Infirmary (1864–1865). Published 1866, p. 329, historical taxis and operative decision sequence
Modern correction: suspected strangulation needs immediate surgical assessment and timely operative treatment. Selected blood tests and imaging, commonly contrast-enhanced computed tomography when useful and feasible, support assessment but should not delay action in a convincing emergency. Normal early laboratory results do not exclude local ischaemia. Current guidance distinguishes an acutely irreducible hernia without evidence of bowel compromise, where supervised reduction may be considered, from suspected strangulation, where emergency surgery is indicated. Ongoing symptoms after apparent reduction also require observation and reassessment.[ref]
Update of the international HerniaSurge guidelines for groin hernia management (2023). Acute groin hernias, manual reduction contraindications, observation and emergency surgery
The diagnostic goal is not merely to name the lump, but to recognize endangered tissue before irreversible injury.A hydrocele contains fluid around the testis; a scrotal hernia contains abdominal contents that have descended through the inguinal canal. Their distinction rests on a combination of location, continuity with the inguinal canal, behaviour and light transmission.
The usual acquired hydrocele is a collection between the layers of the tunica vaginalis. A scrotal hernia is generally an indirect inguinal hernia: a sac of peritoneum, often containing intestine or omentum, follows the spermatic cord into the scrotum. Persistence of the processus vaginalis can permit either a communicating hydrocele or an indirect inguinal hernia, depending on the communication and its contents. Thus the underlying developmental route is related even though the usual clinical appearances differ.[ref]
Hydrocele by MedlinePlus. “Exams and Tests”: examination, light transmission, changes in swelling and imaging
- An uncomplicated hydrocele is typically smooth, fluctuant or tense, and confined to the scrotum. One can usually feel normal spermatic cord above it: one can “get above” the swelling. The testis may be difficult to feel separately and is usually behind the fluid collection. A scrotal hernia extends upwards toward the inguinal canal; its upper limit cannot usually be encircled within the scrotum.[ref]The Ship Captain's Medical Guide by the Maritime and Coastguard Agency. Chapter 7, p. 155, distinguishing continuity into the groin from a swelling confined to the scrotum
- A typical acquired hydrocele has neither an expansile cough impulse nor ready reduction into the abdomen. A reducible scrotal hernia enlarges on standing, coughing or straining, and diminishes on lying down or with gentle clinical reduction; intestine may give a gurgle. An irreducible hernia is an important exception, so failure of reduction does not establish hydrocele.
- For transillumination, a bright light is applied to one side of the swelling in a darkened setting while the examiner views the other side. Clear fluid in a thin-walled hydrocele usually transmits a diffuse glow. Most scrotal hernias do not. Blood, thick walls or an underlying tumour can prevent a hydrocele from transmitting light; apparent transmission alone cannot exclude a hernia, especially in a child.
- A longstanding uncomplicated hydrocele commonly produces heaviness rather than acute systemic illness. A painful, tender, irreducible scrotal hernia with vomiting or abdominal distension raises concern for intestinal obstruction or strangulated hernia, in which the blood supply of the trapped contents is compromised. That requires urgent surgical assessment.
If examination leaves doubt, ultrasonography can establish whether the swelling contains fluid, intestine or a solid tumour, assess the testis and show continuity with the inguinal canal. A collection may obscure a diseased testis; demonstrating fluid does not finish the diagnostic task. Blind puncture is not an appropriate diagnostic shortcut when a hernia remains possible. Even an established hydrocele usually reaccumulates after simple aspiration, which also risks infection.[ref]
Repair of a scrotal hydrocele by the British Association of Urological Surgeons. September 2024 leaflet, “Key points” and “What are the alternatives?”