Table 5 Detailed list of focal vertebral lesions in five pigs

5

C6

Caudo-dorsal, but cranial to metaphyseal growth plate

11–12 o’clock

Neuro-central synchondrosis

Hypodense line outlining ovoid mineralised body towards floor of vertebral canal

OCD^b

C6

Caudal, entire metaphyseal growth plate

Entire clockface

Metaphyseal growth plate

Thin and heterogeneous density

“Physitis”

C6

Right transverse process

Not applicable

In bone between metaphyseal growth cartilage and synchondrosis

Circular hypodense defect surrounded by bone

Cyst

C6-C7

Caudo- and cranio-ventral

5–7 o’clock

Epiphyseal growth cartilage

Connected by small bony bridge

Spondylosis

7^*

C7

Dorsal, entire cranio-caudal length

10–2 o’clock

Neuro-central synchondrosis

Gradual widening to 2–3 times as thick caudally

Type I Salter-Harris fracture

8^c

C6

Left transverse process

Not applicable

Transverse process unknown growth cartilage

Small and apparently fused with the transverse process of C7. The left transverse process of C5 matched the right transverse process of C6 in size.

Transverse process de−/malformation/ “transposition”

T13

Left caudo-ventral

4–6

Block vertebra: growth cartilage absent

5–5.30: three mixed-density cones and one larger hemispherical defect

6–7: sclerosis

Osteochondrosis with repair (filling with bone, sclerosis)

T14

Left cranio-ventral

4–7

Block vertebra: growth cartilage absent

4–6: sclerosis

6–7: spherical defect

Cyst with repair (sclerosis)

T15

Left cranio-ventral

5.30–6.30

Epiphyseal and metaphyseal growth cartilage

Three small mixed-density cones

Osteochondrosis with repair (filling with bone)

T15

Left caudo-ventral

5–6.30

Epiphyseal bone

Sclerosis opposite defect in L1

Old lesion scar or response to L1 lesion?

L1

Left cranio-ventral

4–6

Epiphyseal and metaphyseal growth cartilage

Two conical defects

Osteochondrosis

11

T16

Right caudo-ventral

5–8

Epiphyseal and metaphyseal growth cartilage

5: V-shaped defect

6: two small, hemispherical defects

6–8: two larger hemispherical defects

Left lateral abaxial margin: sclerotic margin

Further caudo-dorsally: two mixed-density conical defects

Osteochondrosis with secondary repair (filling with bone, sclerotic rim)

21

T13

Left cranio-ventral

4–6

Epiphyseal and metaphyseal growth cartilage

Single-lobe defect with mineralised, OCD-like body, but represents reparative ossification centre from caudal and abaxial to defect

OCD with secondary repair (mineralised body represents repair)

T14

Midline cranio-ventral

3–9.30

Epiphyseal and metaphyseal growth cartilage

4: stair-step defect

5: small cone with sclerotic rim

6: small cone

8: stair-step defect

Mineralised bodies: appear as three separate bodies in individual slices but are confluent in 3D rendering.

Osteochondrosis with repair (sclerotic rim, mineralised body represents repair)

T14

Left caudo-ventral

3.30–4.30 and 7

Epiphyseal and metaphyseal growth cartilage

4: two mixed-density lobes, sclerotic rim

7: small, square lobe; also smooth, linear mineralisation (in ligament?) extending in arc from cranio-ventral T14 towards caudo-ventral T13.

Osteochondrosis with repair (filling with bone), also spondylosis

T15

Mid-to-left caudo-ventral

4–8

Epiphyseal and metaphyseal growth cartilage

5.15–30: Two-step stair lesion, spherical with stalk to growth cartilage, with mineralised body advancing from cranio-ventral and around lesion laterally

Cyst with repair (ossification advancing around lesion)