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FIG 1. Two-month-old female infant with right parotid hemangioendothelioma.
A, Transverse sonographic image shows a mildly lobulated tumor of intermediate echogenicity (large arrows) that enlarges and almost completely replaces the normal parotid gland. There are fine echogenic septations and large intratumoral blood vessels (small arrows). Note that involvement of the deep lobe of the gland is incompletely assessed because of the intervening mandibular angle (M).
B, Power Doppler imaging shows numerous large vessels within the tumor.
C, Fat-suppressed T2-weighted transverse image shows the mass to be hyperintense to the small amount of residual normal parotid (curved arrow, see also contralateral side). Large flow voids (arrowhead) represent intratumoral vessels.
D, Contrast-enhanced T1-weighted transverse image shows enhancement of the solid portion of the mass, which extends to involve the entire deep lobe (arrowheads).
E, Delayed planar image from 99mTc-labelled red cell scintigraphy (posterior view) shows uniform, well-circumscribed uptake (arrowhead), similar to that in the heart (h). Early dynamic images (not shown) revealed greater activity in the lesion than the heart in the first minute after injection.
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