Page 323 - Equine Clinical Medicine, Surgery and Reproduction, 2nd Edition

298 CHAPTER 1

VetBooks.ir 1.563 1.564

Fig. 1.563 Diffuse lesion characterised by
enlargement of the SDFT (arrows) and generalised,
heterogeneous decrease of echogenicity. The white
line shows thickening of the paratendon fascia.
1.565
Figs. 1.564, 1.565 (1.564) Transverse scan image
of the palmar metacarpus through zone IIA, showing
a typical acute lesion (a few hours after a harness
race) with minimal increase in cross-sectional area.
The lesion (arrows) is heterogeneous and nearly
isoechogenic to the normal parenchyma, representing
focal haematoma. (1.565) Longitudibal scan in the
same horse showing irregular loss of fibre alignment
in the lesion (arrowheads). Repeat examination several
days later showed a marked increase in both tendon
and relative lesion cross-sectional areas. Red double
arrow shows extent of the SDFT.

Linear organisation is usually poor in early scar tis- replaced by a heterogeneous haematoma (Fig. 1.570),
sue, producing a granular pattern on longitudinal gradually replaced by granular, very hypoechogenic
scans (Fig. 1.568). granulation tissue (Fig. 1.571). No normal fibre pat-
Severe tendon sprains are characterised by a tern is visible. The frayed ruptured ends are enlarged,
marked, diffuse decrease in echogenicity and sig- hypoechogenic and heterogeneous (Fig. 1.572).
nificant enlargement (2–3-fold) (Fig. 1.569). In Lesions most often occur in the metacarpal,
completely ruptured tendons, the normal tissue is unsheathed area and rarely extend proximally into