Prenatal Sonographic and MR Imaging of Extensive Fetal Lymphangioma amination. For further evaluation of these complex abnor- malities, MR imaging was performed using a 1.5-T super- conducting unit (Signa Infinity with twin-speed dual gradi- ent; General Electric Medical Systems, Milwaukee, Wis., U.S.A.) together with a phased array coil. After perform- ing a localized gradient-echo sequence, T2-weighted single- shot fast spin-echo MR images (TR/TE, 1624/79; band- width, 31.2 kHz; field of view, 22 22 cm; matrix, 224 192; slice thickness, 5 mm; intersection gap, 0 mm; number of excitations, 0.56) were obtained in the axial, coronal, and sagittal planes; the acquisition time for each was less than 1 second. The images revealed a large, multilocular, A D B C E Fig. 1. A 26-week-old female fetus with an extensive lymphangioma. A. Prenatal ultrasonography shows a large multiseptated cystic mass (arrows) with variable echo patterns, located at the right of the fetal abdomen and also involving the right lower extremity (open arrows). The transverse diameter of this extremity is much greater than that of the left one (L). Color Doppler ultrasonography revealed no flow within the mass at the time of examination (not shown). B. Sagittal T2-weighted single-shot fast spin-echo MR image (TR/TE, 1624/79) depicts a large intra-abdominal high-signal-intensity mass (arrows) with multiple internal locules, displacing the ipsilateral kidney (K) superiorly. The mass (arrows) extends continuously to the right buttock and right lower extremity. C. Coronal T2-weighted single-shot fast spin-echo MR image (TR/TE, 1624/79) clearly reveals the multilocular cystic nature of the mass (arrows), each locule of which contains multiple fluid-fluid levels. S=Stomach. D. T2-weighted single-shot fast spin-echo MR image (TR/TE, 1624/79) obtained parallel to the right lower fetal extremity shows the distal extent of the lymphangioma (arrows). This presents as an extensive subcutaneous cystic mass, with asymmetric limb hypertrophy. E. Post-mortem photograph depicts a large lymphangioma (arrows) at the right of the abdomen, extending to the right lower extremity. Korean J Radiol 4(4), December 2003 261