Page 584 - The Veterinary Laboratory and Field Manual 3rd Edition

Necropsy guidelines 521

Figure A2.7a Thorax, bovine. Chronic suppurative bronchopneumonia: In this image, the cranioventral
parts of the lungs are dark red and multinodular consistent with bronchopneumonia. A chronic process
is suggested by the presence of abscesses visible from the pleural surface (‡) and fibrous adhesions
between the visceral and parietal pleura (†). See also Plate 47. Photo: courtesy of Dr J. Bystrom, University
of Calgary, Canada.

purulent material) or granulomas (firm nodu-
lar mass lesions with homogenously firm or
caseous centres) are characteristic of chronic
inflammation (see Figure A2.7a and b).
• Degeneration/necrosis: degenerative changes
include intracellular accumulations of fluid,
glycogen or lipid, and impart a pallor to
affected tissue. Necrotic lesions usually have
a similar pallid appearance but will usually
be sunken or depressed consistent with tis-
sue loss which is characteristic (Figure A2.8).
Figure A2.7b Cut surface, lung from Figure A2.7a.
In this image, the extent of abscess formation • Vascular: acute vascular lesions will usually
which could be seen from the pleural surface is appear dark red and swollen due to pool-
evident on the cut surface. See also Online figure 5. ing of blood in affected tissues (see Figures
A2.1 and A2.2). In chronic lesions tissue will
appear shrunken, firm and pallid as a result
of atrophy of devitalized tissue with replace-
ment fibrosis.

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