Why urinary and male pelvic findings show up on scans

CT and MRI scans done for abdominal pain, hip pain, aorta checks, cancer screening, or other reasons often capture parts of the urinary tract and male pelvis. That means the report may mention the kidneys, ureters, bladder, prostate, scrotum, or groin even when those were not the main reason for the test.

These findings are often called incidental findings. Incidental does not mean fake or unimportant. It means the finding was discovered while looking for something else. Some are common and harmless. Others matter more depending on symptoms, lab results, age, prior surgery, and whether the finding is new.

This article is general education, not a diagnosis. Your own results should be interpreted by your clinician and the official radiology report, along with your symptoms and lab tests.

Enlarged prostate and bladder-base indentation

A common CT or MRI phrase is prostatomegaly, which means an enlarged prostate. Another phrase is bladder-base indentation or intravesical protrusion. This means the enlarged prostate pushes upward into the bottom of the bladder.

In many men, this pattern is most often related to benign prostatic hyperplasia, or BPH. Benign means non-cancerous, and hyperplasia means extra growth of prostate tissue. Imaging may describe a nodular or heterogeneous central gland, especially on prostate MRI, which can fit with BPH.

An enlarged prostate on CT or MRI does not automatically mean prostate cancer. It also does not rule cancer out. A dedicated prostate MRI can look for suspicious lesions using several sequences, often summarized with a PI-RADS score in the official report. A routine abdomen, pelvis, hip, or aorta scan is not designed to fully evaluate prostate cancer risk.

Symptoms that make prostate enlargement more relevant

Weak urine stream
Starting and stopping while urinating
Urgency or frequent urination
Getting up often at night to urinate
Feeling that the bladder does not empty fully
Straining to urinate
New urinary retention, meaning inability to urinate

If the bladder looks moderately distended, thickened, or trabeculated on imaging, the radiologist may wonder whether the bladder has been working harder over time against prostate-related blockage. Your clinician may compare this with symptoms, a urine test, kidney blood tests, prostate exam, PSA history, and sometimes a bladder scan after urination.

Do CT or MRI show whether kidney function is okay?

Imaging can show the shape, size, drainage, stones, swelling, masses, and visible blockage of the kidneys and ureters. It cannot directly measure how well the kidneys filter blood. Kidney function is usually assessed with blood tests such as creatinine and estimated glomerular filtration rate, plus urine testing when needed.

On a contrast CT urogram, a reassuring description might say that both kidneys excrete contrast into the collecting systems and bladder, with no hydronephrosis or hydroureter. That suggests urine is draining through the visible urinary tract at the time of the scan. However, lab tests are still needed to understand kidney function.

Tiny non-blocking kidney stones

CT is very good at detecting kidney stones. A report may mention tiny nonobstructing renal calculi. This means small stones are sitting in the kidney but are not currently blocking urine flow.

Non-blocking stones may cause no symptoms. They may also become relevant if someone has flank pain, repeated urinary infections, visible blood in the urine, or a history of passing stones. The key point is whether there is obstruction. A stone in the ureter with urine backup is more urgent than a tiny stone quietly sitting in the kidney.

Questions patients often ask about small stones

Do they need treatment? Not always. Many are monitored or managed with prevention steps, depending on history and risk.
Can they cause blood in urine? Stones can be one possible cause, but blood in urine may still need a full medical evaluation.
Should I change my diet? Stone prevention advice depends on stone type, urine findings, medications, and medical conditions, so it should be personalized by a clinician.

Hydronephrosis: when kidney drainage looks swollen

Hydronephrosis means the urine-collecting part of the kidney is dilated or swollen. It can happen when urine flow is slowed or blocked, but it can also be chronic or related to anatomy. CT may describe mild, moderate, or severe hydronephrosis.

This finding becomes more important when it involves a solitary functioning kidney, comes with fever or flank pain, or is associated with abnormal kidney blood tests. Sometimes the scan does not show a clear stone or mass, and doctors may consider follow-up with renal ultrasound, CT urogram, or urology evaluation depending on the situation.

Hydronephrosis is different from a tiny non-blocking kidney stone. Hydronephrosis suggests the drainage system is enlarged; a non-blocking stone does not show current blockage.

Hydrocele, varicocele, and scrotal findings

Scrotal findings are sometimes partly seen on pelvis, hip, or abdomen scans. Because those scans are not optimized for the testicles and scrotum, the report may use cautious language such as likely hydrocele or probable varicocele.

Hydrocele

A hydrocele is fluid around the testicle. It is often benign, but it may be more relevant if there is scrotal swelling, heaviness, pain, a size difference, or a new lump. A dedicated scrotal ultrasound can look more closely at the testicle, epididymis, and surrounding fluid.

Varicocele

A varicocele is enlarged veins in the scrotum, more commonly noted on the left. It may feel like a soft bag of cords and can be associated with aching, heaviness, or fertility evaluation. Doppler scrotal ultrasound is the usual targeted test when confirmation is needed.

Groin hernia or spermatic cord lipoma

CT or MRI may mention a fat-containing inguinal hernia, inguinoscrotal hernia, or spermatic cord lipoma. These can look similar on some scans because fat follows the inguinal canal toward the scrotum. A hernia may contain only fat, or less commonly bowel. If no bowel is seen and there are no signs of inflammation, it may be described as uncomplicated.

Symptoms matter. A small fat-containing hernia may be found incidentally. Groin pain in athletes, for example, can also come from muscles, tendons, hip joints, pubic bone stress, or nerve irritation. A physical exam helps match the scan finding to the exact location of pain.

Urgent hernia symptoms

A groin bulge that becomes suddenly very painful
A bulge that cannot be pushed back in when it usually could
Vomiting, fever, abdominal swelling, or severe worsening pain
Skin redness or tenderness over the bulge

Why ultrasound or urology follow-up may be suggested

CT and MRI are powerful, but they are not always the best test for every urinary or scrotal question. A renal ultrasound can follow hydronephrosis without radiation. A scrotal ultrasound is the standard way to assess hydrocele, varicocele, testicular blood flow, and a palpable lump. A urologist can connect imaging with urinary symptoms, PSA trends, prostate exam, urine testing, and kidney function.

Follow-up is more likely when a finding is new, symptomatic, uncertain, or potentially affecting kidney drainage. It is also more important when imaging raises concern for bladder outlet obstruction, a solitary kidney, repeated infections, visible blood in urine, or abnormal labs.

When to talk to your doctor

Talk with your doctor or urologist about incidental urinary or male pelvic findings if you have urinary symptoms, visible blood in the urine, flank pain, scrotal swelling or pain, a new groin bulge, fertility concerns, elevated or changing PSA, or abnormal kidney blood tests.

Seek prompt medical care for fever with urinary symptoms, severe flank or groin pain, inability to urinate, a painful non-reducible hernia bulge, vomiting with a groin bulge, or rapidly worsening symptoms. This article is for general education only and is not a diagnosis or a substitute for your official radiology report and medical care.

Enlarged Prostate, Stones, Hydrocele on CT/MRI