Radiology Packet 16

1
Radiology Packet 16

• Skull

2
16 wk old puppy

• HX presented for routine vaccinations, owner
  reports puppy is very lethargic, very quiet, and
  sometimes appears disoriented

3
16 wk old puppy

• RF
• The cranial vault is relatively large and the
  inner surface is smooth and homogenous, lacking
  the usual ridges of bone that indicate the brain
  sulci.
• Discontinuity of the cranial bones is noted in
  the most dorsal aspect.
• RD
• Hydrocephalus (congenital)
• Open fontanelle

4
16 wk old kitten

• HX presented for acute injury of falling from a
  porch step (10 high) and is now tetraparetic

5
16 wk old kitten

• RF
• Marked mal-alignment of the spine at the level of
  C1-C2 visible in the lateral view.
• Note the greatly increased space between the
  dorsal arch of C1 and the large spinous process
  of C2.
• There is an impression of ventral angulation of
  the dens (odontoid process of C2).
• RD
• Atlanto-axial subluxation
• Next
• Surgical reduction and stabilization of the
  atlanto-axial subluxation

6
2 yr old female PomeranianPenny

• HX presented with ataxia and disorientation

7
2 yr old female PomeranianPenny

• RF
• Enlargement of the occipital foramen.
• Increased size of the cranial vault and the inner
  surface of the calvarium is smoother than normal.
• RD
• Occipital dysplasia
• Possible hydrocephalus

8
5 yr old FS Mix CanineBrandy

• HX hit by car, on physical exam the dog seems
  painful when head is manipulated

9
5 yr old FS Mix CanineBrandy
10
5 yr old FS Mix CanineBrandy

• RF
• In the DV view a comminuted fracture of the right
  hemimandible is visible, it is at the junction of
  the horizontal and vertical rami in the region of
  the coronoid process.
• RD
• Comminuted fracture of the right hemimandible
• Next
• Surgical stabilization of the fracture (plate or
  cerclage wire)

11
1 yr old female GSDPenny

• HX Presented for difficulty in opening mouth,
  eosinophilia is present on the CBC. Also, prior
  history of being bitten in the region of the
  tempromandibular area when she was a puppy.

12
1 yr old female GSDPenny
13
1 yr old female GSDPenny

• RF
• A large, well circumscribed mineralized mass is
  seen between the ramus of the mandible and the
  zygomatic arch on the left, it is mottled in
  appearance.
• The origin is hard to define but it appears to be
  arising from the lateral margin of the mandible.
• The zygomatic arch is thickened in the area of
  the mass.
• RD
• R/O
• Osteoma
• Osteochondroma
• Calcinosis circumscripta (tumoral calcinosis)
• Next
• Biopsy