Diagnostic Ultrasound - Abdomen and Pelvis
Testicular Microlithiasis (Left) Transverse grayscale ultrasound of the left testis demonstrates clustered microlithiasis ſt. The patient had a history of right orchiectomy for germ cell tumor and was being followed-up by ultrasound on an annual basis. (Right) Sagittal grayscale ultrasound follow-up on the same patient after 11 years demonstrates development of multiple hypoechoic masses . Pathology confirmed multifocal seminoma. Diagnoses: Scrotum (Left) Sagittal color Doppler ultrasound of the right testis demonstrates a large hypoechoic mass in the background of extensive microlithiasis. Pathology confirmed a classic seminoma. (Right) Sagittal grayscale ultrasound of the right testis demonstrates diffuse extensive microlithiasis. This limits adequate assessment of the testicular parenchyma for tumor, hence these must be referred to specialist centers for alternate methods of future screening. (Left) Transverse grayscale ultrasound of the left testis demonstrates an isolated microlith in the parenchyma. This does not meet the definition of testicular microlithiasis and is likely a sequela of prior infection or trauma. (Right) Transverse grayscale ultrasound of the left testis demonstrates presence of microcalcifications and macrocalcifications (with shadowing st). Patients with any intratesticular calcification should be considered to be at higher risk of a testicular malignancy. 699
Testicular Torsion/Infarction Diagnoses: Scrotum TERMINOLOGY • Spontaneous or traumatic twisting of testis & spermatic cord within scrotum, resulting in vascular occlusion/infarction IMAGING • Absent or decreased abnormal testicular blood flow on color Doppler US • Findings vary with duration and degree of rotation of cord • Unilateral in 95% of patients • Role of spectral Doppler is limited; may be helpful to detect partial torsion; in partial torsion of 360° or less, spectral Doppler may show diminished diastolic arterial flow • Spiral twist of spermatic cord cranial to testis and epididymis causing torsion knot or whirlpool pattern of concentric layers KEY FACTS PATHOLOGY • Varying degrees of ischemic necrosis & fibrosis depending on duration of symptoms • Undescended testes have an increased risk of torsion • Intravaginal torsion: Common type, most frequently occurs at puberty CLINICAL ISSUES • Acute scrotal/inguinal pain; swollen, erythematous hemiscrotum without recognized trauma • Reducing time lag between onset of symptoms and time of surgical or manual detorsion is of utmost importance in preserving viable testis • Nonviable testicle usually removed; higher risk of subsequent torsion on contralateral side • Venous obstruction occurs 1st, followed by obstruction of arterial flow, which leads to testicular ischemia (Left) Graphic shows spiral twist st of the spermatic cord with torsion, leading to venous congestion and compromised blood supply to the testis ſt. (Right) Sagittal power Doppler ultrasound of the left testis in a young male with intermittent symptoms of left testicular pain demonstrates a large focal avascular heterogeneous area consistent with infarct that is likely secondary to intermittent torsion. (Left) Transverse color Doppler ultrasound of the testis in a young male with an acute painful scrotum for 48 hours shows a heterogeneous avascular testis with cystic areas st, consistent with an infarcted testis with necrosis secondary to torsion. (Right) Sagittal color Doppler ultrasound superior to the left testis in a young male with acute painful scrotum shows a whirlpool sign secondary to a twisted spermatic cord. Patient was manually detorsed followed by bilateral orchidopexy. 700
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Testicular Microlithiasis<br />
(Left) Transverse grayscale<br />
ultrasound of the left testis<br />
demonstrates clustered<br />
microlithiasis ſt. The patient<br />
had a history of right<br />
orchiectomy for germ cell<br />
tumor <strong>and</strong> was being<br />
followed-up by ultrasound on<br />
an annual basis. (Right)<br />
Sagittal grayscale ultrasound<br />
follow-up on the same patient<br />
after 11 years demonstrates<br />
development of multiple<br />
hypoechoic masses .<br />
Pathology confirmed<br />
multifocal seminoma.<br />
Diagnoses: Scrotum<br />
(Left) Sagittal color Doppler<br />
ultrasound of the right testis<br />
demonstrates a large<br />
hypoechoic mass in the<br />
background of extensive<br />
microlithiasis. Pathology<br />
confirmed a classic seminoma.<br />
(Right) Sagittal grayscale<br />
ultrasound of the right testis<br />
demonstrates diffuse<br />
extensive microlithiasis. This<br />
limits adequate assessment of<br />
the testicular parenchyma for<br />
tumor, hence these must be<br />
referred to specialist centers<br />
for alternate methods of<br />
future screening.<br />
(Left) Transverse grayscale<br />
ultrasound of the left testis<br />
demonstrates an isolated<br />
microlith in the<br />
parenchyma. This does not<br />
meet the definition of<br />
testicular microlithiasis <strong>and</strong> is<br />
likely a sequela of prior<br />
infection or trauma. (Right)<br />
Transverse grayscale<br />
ultrasound of the left testis<br />
demonstrates presence of<br />
microcalcifications <strong>and</strong><br />
macrocalcifications (with<br />
shadowing st). Patients with<br />
any intratesticular<br />
calcification should be<br />
considered to be at higher risk<br />
of a testicular malignancy.<br />
699