PMC4329690_01
(A) PD images show hyperintense signal in the thickened synovium(paired arrows). (B) T2WI spin echo coronal image shows hypointense and thickened synovium (paired arrows) with moderate joint effusion. (C) On T1WI, few foci of T1 shortening (interrupted arrow) are seen in the diffusely thickened synovium. (D) Post-contrast fat-saturated T1WI shows moderate enhancement in the soft tissue around the shoulder joint. The arrow points to signal void due to flow in patent aneurysmal sac which was misinterpreted initially
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F1
T A-series, DA Best, The Netherlands) showed lobulated soft tissue lesion around the shoulder joint with diffuse synovial proliferation. The soft tissue lesion and proliferated synovium had predominantly low signal intensity on T1-andT2-weighted spin echo (SE) sequences [Figure 1].
(A) B mode ultrasound shows thickened and hypoechoic synovium (paired arrows). Extrinsic erosions (black arrow) are seen in the humeral head with moderate joint effusion. (B) The pseudoaneurysm in the Inferior axillary region shows bidirectional flow (arrow) on color Doppler study. (C-D) CT angiography shows pseudoaneurysm (arrow) communicating with axillary artery. The thrombosed portion of aneurysm(interrupted arrow) is appearing as hyperdense soft tissue lesion around the contrast-filled patent aneurysmal sac (arrow)
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F2
Color Doppler (Toshiba 200, Tokyo, Japan) showed turbulent bidirectional flow within this anechoic focus suggestive of a pseudoaneurysm [Figure 2], which was communicating with a branch of axillary artery. Showed communication of the pseudoaneurysm with the posterior circumflex branch of axillary artery [Figure 2]. A large hyperdense (80-110 HU) soft tissue lesion surrounded the patent aneurysmal sac (arrow in Figure 2).