Testicular Mass
A testicular mass is any lump, swelling, or abnormal area found within or around the testis. The critical distinction is whether it lies inside the testis itself or outside it, because that single question shifts the likelihood of cancer dramatically: masses arising within the testis are frequently malignant, while the great majority of lumps in the surrounding scrotal structures are benign. Ultrasound resolves this quickly and reliably and is the cornerstone of evaluation. Testicular cancer is the most common solid cancer in young men, and it is also among the most curable of all cancers—including when it has already spread—which makes prompt assessment of any new testicular lump genuinely worthwhile rather than merely cautious advice.
What is it?
Each testis sits within the scrotum, surrounded by a tough fibrous capsule and a layered sac of membranes. Attached along its back edge is the epididymis, a coiled tube where sperm mature, which continues into the vas deferens. The spermatic cord, containing the vas, blood vessels, and nerves, runs up through the inguinal canal into the abdomen. Understanding this arrangement matters, because where a lump sits within it determines almost everything that follows.
The single most useful distinction in evaluating a testicular mass is intratesticular versus extratesticular—inside the testis or outside it.
Masses arising within the testis carry a high likelihood of malignancy. A solid intratesticular mass in an adult is treated as cancer until proven otherwise, and this assumption drives the urgency of assessment.
Masses arising outside the testis—in the epididymis, the surrounding fluid space, or the spermatic cord—are overwhelmingly benign. Cancers of these structures exist but are rare.
Ultrasound makes this distinction reliably and quickly, which is why it is the pivotal investigation and why a man with a scrotal lump should have one rather than being reassured or observed on examination alone.
The benign extratesticular causes are common and account for most scrotal lumps.
Epididymal cysts and spermatoceles are fluid-filled swellings in the epididymis, typically felt as a separate lump above and behind the testis. They are very common, harmless, and need treatment only if large or uncomfortable.
Hydrocele is a collection of fluid between the layers of membrane surrounding the testis, producing smooth scrotal swelling that transilluminates. Most are idiopathic, though a hydrocele developing alongside a tumour is well recognised, which is why a new hydrocele in a young man warrants ultrasound rather than assumption.
Varicocele is enlargement of the veins draining the testis, classically described as feeling like a bag of worms, more common on the left, and associated with impaired fertility in some men. A new right-sided varicocele, or one that does not empty when lying down, warrants abdominal imaging, since it can occasionally reflect an abdominal mass obstructing venous drainage.
Inguinal hernia extending into the scrotum can present as a scrotal lump and is distinguished by extending up into the groin and often by reducibility.
Epididymitis and epididymo-orchitis produce painful swelling with tenderness, often with fever and urinary symptoms, and are inflammatory rather than neoplastic—though a mass that persists after treated infection requires reassessment rather than continued antibiotics.
The intratesticular causes are where the concern lies.
Germ cell tumours account for the large majority of testicular cancers and are divided into two groups with different behaviour and treatment. Seminomas typically occur slightly later, often in the fourth decade, tend to be more indolent, and are highly sensitive to radiotherapy and chemotherapy. Non-seminomas—including embryonal carcinoma, yolk sac tumour, choriocarcinoma, teratoma, and mixed tumours—occur in younger men on average, behave more aggressively, and are treated differently. Mixed tumours containing both elements are managed as non-seminomas.
Sex cord-stromal tumours, principally Leydig cell and Sertoli cell tumours, are much less common and are usually benign, though a minority behave malignantly. Leydig cell tumours can produce hormones, causing breast enlargement or, in children, precocious puberty.
Lymphoma is the most common testicular malignancy in men over 60 and often presents as painless enlargement, sometimes bilaterally. Metastases to the testis are uncommon.
Benign intratesticular lesions do exist and are worth knowing about, since not every intratesticular finding is cancer. Epidermoid cysts are benign and have a characteristic layered onion-ring appearance on ultrasound that can allow testis-sparing surgery. Simple intratesticular cysts, testicular microlithiasis, segmental infarction, sarcoidosis, tuberculosis, and adrenal rest tissue in congenital adrenal hyperplasia can all produce intratesticular abnormalities.
Testicular microlithiasis deserves specific comment because it appears frequently on reports and causes disproportionate worry. It describes tiny calcifications scattered through the testis, seen on ultrasound. It is common, usually incidental, and in men with no other risk factors it is not currently considered an indication for routine surveillance scanning. Its significance rises when it coexists with infertility, undescended testis, prior testicular cancer, or a family history, in which case follow-up may be advised.
The presentation of testicular cancer has one feature that shapes outcomes more than any biological factor: it is usually painless. A firm, painless lump or an area of hardness within the testis, sometimes noticed incidentally, is the classic presentation. Because pain is absent, many men wait—weeks or months—assuming that something that does not hurt cannot be serious. Delay in presentation is well documented and is the main reason a proportion of men present with advanced rather than early disease. This is worth stating plainly: painlessness is a feature of the disease, not evidence against it.
Other presentations include a sensation of heaviness or dragging, change in size or consistency of the testis, dull ache in the lower abdomen or groin, and a new hydrocele. Acute pain can occur if there is bleeding into a tumour. Breast tenderness or enlargement can result from hormone production by some tumours.
Symptoms of spread reflect the characteristic pattern: testicular cancer drains first to the lymph nodes behind the abdomen, following the embryonic origin of the testis near the kidneys rather than the local scrotal drainage. Enlarged retroperitoneal nodes can cause back pain, abdominal fullness, or leg swelling. Further spread produces a lump above the collarbone, cough or breathlessness from lung involvement, and general symptoms.
An important contrast: sudden severe testicular pain with a swollen, tender, high-riding testis suggests torsion, which is a surgical emergency requiring assessment within hours rather than days.
Evaluation is straightforward and should be prompt.
Examination assesses the location, size, consistency, and tenderness of the lump, whether it is separate from or part of the testis, and whether it transilluminates.
Scrotal ultrasound with Doppler is the primary and usually decisive test. It reliably separates intratesticular from extratesticular, solid from cystic, and vascular from avascular, and characterises lesions well enough that a confident direction of management usually follows immediately. It is quick, painless, and involves no radiation.
Serum tumour markers—alpha-fetoprotein, beta-hCG, and lactate dehydrogenase—are measured before any surgery. Their role is broad: elevated AFP effectively excludes pure seminoma regardless of what the pathology shows; markers contribute to staging and prognostic grouping; and their decline after treatment, measured against expected half-lives, indicates response. Normal markers do not exclude cancer, since a substantial proportion of testicular tumours produce none.
CT of the chest, abdomen, and pelvis stages the disease, with particular attention to the retroperitoneal nodes.
MRI is used selectively when ultrasound findings are equivocal and further characterisation would change management.
One point about diagnosis is emphatic and worth understanding: biopsy through the scrotum is avoided. The scrotum and the testis have different lymphatic drainage, and violating the scrotum can seed tumour into a compartment it would not otherwise reach, altering the pattern of spread and complicating treatment. For the same reason, the testis is removed through a groin incision with early control of the spermatic cord rather than through the scrotum. This is why a suspicious intratesticular mass proceeds to orchidectomy rather than to biopsy—the operation is both the diagnostic and the therapeutic step.
Important to Know
The message that matters most is that a new testicular lump should be assessed promptly, and that doing so is worthwhile because testicular cancer is among the most curable of all cancers when treated. Care is coordinated by urologists, with medical and radiation oncology, radiology, pathology, and fertility services involved when cancer is confirmed.
Delay is the principal modifiable factor in outcome, and the reasons for it are well understood: the lump does not hurt, the topic is embarrassing, and men in the affected age group are the least likely of any group to seek medical attention. Assessment is a brief examination and an ultrasound. Framing this clearly is more useful than general encouragement, because the specific barrier is the assumption that painless means harmless.
Benign extratesticular findings generally need no treatment. Epididymal cysts, spermatoceles, and small hydroceles are managed with reassurance, with surgery offered only for size or discomfort. Varicoceles are treated when associated with pain, testicular growth impairment in adolescents, or infertility. A hydrocele in a young man is drained or repaired only after the underlying testis has been imaged.
Where ultrasound shows a solid intratesticular mass, radical inguinal orchidectomy is standard. Removing the testis through a groin incision with early clamping of the cord prevents tumour seeding and preserves normal lymphatic drainage patterns. The removed testis provides the definitive diagnosis. A prosthesis can be placed at the same operation or later, and this is worth asking about in advance rather than afterwards.
Testis-sparing surgery is considered in specific situations—small lesions, a solitary testis, bilateral tumours, or where imaging strongly suggests a benign lesion such as an epidermoid cyst—and is performed at centres with frozen section pathology available during the operation.
Sperm banking should be offered and discussed before any treatment. Testicular cancer and its treatment can both impair fertility, and many men already have reduced sperm quality at diagnosis. Banking sperm before orchidectomy, and certainly before chemotherapy or radiotherapy, preserves options. This conversation is easy to overlook in the urgency of a cancer diagnosis, and it is entirely reasonable for a man to raise it himself if it has not been mentioned.
Treatment after orchidectomy depends on tumour type and stage. Many men with early-stage disease are managed with surveillance—regular markers, imaging, and clinical review—rather than immediate further treatment, on the reasoning that most will not relapse and those who do can be cured with treatment at that point. Others receive chemotherapy, radiotherapy in some seminoma cases, or retroperitoneal lymph node dissection. Cure rates are high across stages, and even men presenting with widespread metastatic disease have a substantial chance of cure with modern chemotherapy—an outcome that is genuinely unusual among cancers and worth knowing when facing the diagnosis.
Long-term follow-up is important and continues for years, since relapse can occur late and is treatable when detected. It also monitors for cancer in the remaining testis, which carries a modestly increased risk, and for late effects of treatment including cardiovascular disease, metabolic changes, reduced testosterone, hearing and nerve effects from certain chemotherapy agents, and a small increased risk of second cancers. Survivorship care is a recognised part of management rather than an afterthought.
Testosterone levels are checked after treatment, since some men develop deficiency after losing one testis or after chemotherapy, and replacement improves energy, mood, sexual function, and bone health where it is genuinely low.
Self-examination is commonly recommended, though it is worth being accurate about the evidence: routine self-examination has not been shown in trials to reduce mortality, and formal screening is not recommended in the general population. Its practical value lies in familiarity—men who know what their testes normally feel like are more likely to notice a change and seek help sooner. Men at higher risk, particularly those with a history of undescended testis or prior testicular cancer, benefit most from awareness.
Care is coordinated by urology with oncology, radiology, pathology, and fertility services. Imaging, tumour markers, pathology, and clinical findings are interpreted together rather than in isolation.
Patient education plays an important role. Understanding that most scrotal lumps are benign but that any new intratesticular lump needs prompt ultrasound, that painlessness is characteristic rather than reassuring, that biopsy through the scrotum is deliberately avoided, that fertility preservation should be discussed before treatment, and that cure rates are high even with advanced disease all contribute to appropriate care.
Red flag symptoms include any new lump, firm area, or change in consistency within a testis, whether or not it is painful; a testis that has become larger, harder, or different from the other; a new fluid collection around a testis; sudden severe testicular pain with swelling, which suggests torsion and requires emergency assessment within hours; persistent back or abdominal pain; a lump above the collarbone; breathlessness or coughing up blood; breast enlargement or tenderness; and unexplained weight loss. Any new intratesticular abnormality warrants prompt medical evaluation and scrotal ultrasound.