Ankle and Foot 47 - Department of Radiology - University of ...

47 Ankle and Foot 2227 47
J K L
M
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Figure 47-28, cont’d The marker (m) indicates the site of maximal tenderness. At this level, the PB is split into two pieces (black arrows),
separated by the intact PL (white arrow). Oblique coronal T1-weighted (J), PD-weighted (K), and T2-weighted (L) images anterior to the LM,
through the pain marker (m). All three sequences show increased signal in the PB (black arrow) as opposed to the normal black signal in the PL
(white arrow). Although the “magic angle” can artifactually increase the intratendinous signal on the short TE sequences (T1 and PD), magic angle
does not affect the long TE T2-weighted sequence. Thus, the bright signal in the PB on the T2-weighted image represents a true intrasubstance
tear. The abnormal fluid in the common peroneal tendon sheath (white arrowhead) indicates active tenosynovitis. M and N, Far lateral sagittal
inversion recovery images demonstrate the abnormal fluid in the common peroneal tendon sheath (white dotted rectangle) as well as the edema
in the swollen PB (black dotted rectangle).
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