Nutritional Secondary Hyperparathyroidism in the Horse

lioentgcnologic Ohscrvntions 55
I,'(?. 20. Post-mortcm lateral vicu of rostra1 end of left mandiblc. Control colt
upper, NSI-I 2 lo\vcr. Note radioluccnt iiiiliary mottliiia in NSll 2 comparcd to
dcnsc cortical Ipattcrn in control, also cxtcnsivc resorption of Imnc surrounding
incisor tccth in NSk 1 2 comparcd to control.
generalized throughout the head, ribs, and limbs (the vertebral column
and pelvis were not radiographed). These changes were similar to
those seen during life but much more clearly defined. The contrast
between the teeth and surrounding bone was striking (Fig. 19). The
cortical bone along the ramus of the mandible in NSH 2 was mottled
and thinned to the point of nonesistence. The mandibular canals in
NSf I2 and 3 blended with the surrounding bone in sharp contrast to
the control's mandible, in which the canal was clearly defined. There
was also a loss of contrast between diploe and lamina in the roof
of the cranium. The bone had a radiolucent moth-eaten appearance
(Figs. 19 and 20).
The cortices of the 1-cm.-thick transverse sections from the mid-
diaphysis of the long bones were radiolucently stippled throughout
(Fig. 21). There was also a radiolucent mottled appearance in the
endosteal area, becoming less evident toward the periosteum. In some
cases the periphery of the medullary cavity had a distinct scalloped
appearance (Fig. 21).
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