Diagnostic ultrasound ( PDFDrive )

156 PART II Abdominal and Pelvic Sonography
A
B
FIG. 5.24 Hemangioma in Two Patients. (A) Small (1.4-cm), well-deined, rounded, echogenic lesion (arrow) is similar to the typical liver
hemangiomas. (B) Coronal ultrasound scan shows multiple echogenic splenic hemangiomas of different sizes in the spleen. Note the calciied
splenic artery adjacent to the vein.
FIG. 5.25 Hamartoma. Round, 5-cm, slightly hyperechoic lesion
(arrows) arising from the medial margins of the spleen.
some demonstrate increased vascularity on color Doppler
imaging. 63 he sonographic appearance of littoral cell angioma
is variable and includes reports of hypoechoic and hyperechoic
focal lesions as well as a difuse mottled pattern without discrete
lesions 40,64 (Fig. 5.26). Sclerosing angiomatoid nodular transformation
is a rare benign vascular lesion of the spleen. Appearance
on ultrasound has been described as heterogeneous hypoechoic. 65
hese may grow, and thus be diicult to distinguish from more
FIG. 5.26 Littoral Cell Angioma. Oval, well-deined, 5-cm echogenic
lesion. Splenectomy was performed when this lesion demonstrated
growth during follow-up.
concerning lesions, and thus may need biopsy for diagnosis.
Inlammatory pseudotumors usually present as a well-deined
hypoechoic mass. 66
Splenic infarction is one of the more common causes of focal
splenic lesions and may mimic a mass on ultrasound. If a typical
peripheral, wedge-shaped, hypoechoic lesion is noted, splenic