Multimodality-imaging manifestations of primary renal-allograft synovial sarcoma: First case report and literature review

Table 1 Principle findings for each image study

Examination	Manifestations
Ultrasonography	Multiple, well-defined, solid, hypo-echo neoplasms, hypo-vascular with punctiform blood flow signal
CECT-1	Slightly hyper-density neoplasms, slow homogeneous enhancement similar to simple cysts
CEUS	Branchlike, twisted, and tortuous vessel perfusion during cortical phase, heterogeneous slightly hyper-enhancement, no clear early wash-out, slightly higher enhanced pseudocapsule could be seen
CECT-2	Neoplasms grew obviously bigger, slightly hyper-density, heterogeneous enhancement with few spotty and patchy non-enhanced foci inside, margins were clearer during the venous phase
Parametric imaging for CEUS	DVP parametric imaging showed heterogeneous hyper-vascular enhancement; DVP curve manifested as non-washout type

CECT-1: Contrast-enhanced computed tomography of the first time; CEUS: Contrast enhanced ultrasonography; CECT-2: Contrast-enhanced computed tomography of the second time (one month post CECT-1); DVP: Dynamic vascular pattern.