Page 325 - Equine Clinical Medicine, Surgery and Reproduction, 2nd Edition

300 CHAPTER 1

VetBooks.ir 1.570 1.571

Figs. 1.570, 1.571 (1.570) Acute SDFT rupture (transverse ultrasonographic image), zone IIB. The
tendon parenchyma is very hypoechogenic and heterogeneous with echogenic tissue aggregates surrounded
by hypoechogenic fluid and haemorrhage. The tendon and surrounding soft tissues are very enlarged and the
tendon margins are ill defined. (1.571) After 2 weeks, the lesion has organised to a diffuse granulation tissue,
with a more homogeneous, granular pattern and better-defined contours.

1.572

Fig. 1.572 Acute SDFT rupture (longitudinal
ultrasonographic image), zone IIB/IIIA. The
ruptured tendon distal end has retracted distally,
with frayed fibres ending abruptly (arrowheads).
Heterogeneous haemorrhage accumulates
between the ruptured ends (right of image).
Peritendinous oedematous tissue is markedly
thickened and hypoechogenic (arrow).

the carpal sheath (Fig. 1.573). Lesions can occur animals. Metacarpal lesions sometimes extend into
primarily within the carpal canal and most of these the digital sheath (Fig. 1.575), and these must be
are severe, diffuse and can lead to spontaneous rup- differentiated from longitudinal tears in the fetlock
ture (Fig. 1.574). This is most common in older or pastern area.