occipital bone swelling in dogs

Bony proliferation is often bilateral and may be asymmetric, although unilateral disease can occur. The temporalis muscle originates from the parietal, temporal, frontal, and occipital bones and inserts onto the coronoid process of the mandible. She's a very hyper dog so the act of her hitting her head is not the least bit surprising.

This is an automated general reminder to please follow The Sub Rules when discussing this question: Do not comment with anecdotes about your own or others' pets. These canals give exit to hypoglossal nerves (cranial nerve 12) and entrance to arteries.

i looked up parts of the skull on a dog and there was one picture that had an arrow pinting to exactly where the bump is on my dogs head..... and it was called the occipital bone. J. Kevin Kealy MVB, MVM, MRCVS, DVR, DECVDI (Hon), ... John P. Graham MVB, MSc, DVR, MRCVS, DACVR, DECVDI, in Diagnostic Radiology and Ultrasonography of the Dog and Cat (Fifth Edition), 2011. Such a sulcus, called an occipitomarginal sulcus, represents an alternative pathway for blood to drain from the brain. Schedule periodic physical and radiographic examinations of the animal (every 6 to 8 weeks) until skeletal maturity. Dea Bonello, ... Frank J.M.

Treatment consists of supportive care and analgesics until the animal reaches skeletal maturity.

The internal occipital protuberance lies at the center of the cruciform eminence. Nutritional support by gastrostomy or enterostomy tube or parenteral supplementation may be necessary (see Chapter 3). Cisternal puncture for CSF collection or myelography is contraindicated in dogs in which cerebellar herniation may occur.

Alternatively, there may be an inherited predisposition in several breeds, but the presence of an additional factor, perhaps an infectious agent, is required for the disease to be expressed. 2-14 to 2-16).

However, the occurrence of the syndrome in diverse breeds suggests that there may be more than one cause of the condition. Malformation of the occipital bone causes elongation and caudal displacement of the cerebellar vermis through the foramen magnum. 2-10, 2-11, 2-14 and 2-17). Nicholas J. Trout, in Handbook of Small Animal Practice (Fifth Edition), 2008. In the normal animal the shape of the foramen magnum varies, making it difficult to evaluate the exact shape of the foramen without the use of CT or MRI. It is commonly seen in terrier breeds, 3 to 8 months of age, with males and females equally affected. CMO occurs predominantly in terriers, especially Scottish, West Highland white, and Cairn terriers, but the disease also has been reported in the boxer, Labrador retriever, Great Dane, and Doberman pinscher. An uncommon proliferative bone disease, craniomandibular osteopathy, also known as “lion jaw,” usually involves the mandibular rami and the tympanic bullae in Scottish, cairn, and West Highland white terriers.30 Other breeds that occasionally experience this condition include the Boston terrier, Labrador retriever, Great Dane, Doberman pinscher,31 German shepherd dog, boxer, and mongrels.24 Other bones of the head and some long bones have occasionally been involved. Basisphenoid bone (odd). Apparently I’ve been calling them the wrong thing for years.

Formed by a body and wings (Figs. okay so i know that much but the past few days i've noticed that there is a soft bump on the occipital bone under the skin and fur. A variety of skin infections can affect the scalp, which can …

If the angular processes of the mandible and tympanic bullae are involved, jaw movement is diminished, even under anesthesia. Superior nuchal lines lie to either side of the midline on the ectocranial surface of the squamous portion.

Congenital malformation of the foramen magnum occurs in small and toy dog breeds.

The MRI features of CMO in an 8-month-old Airedale terrier have been described.199. The zygomatic arch of the mouse is formed by the zygomatic bone and the zygomatic processes of the maxilla and the temporal bone. The body of the mandible is pierced by the alveoli of the incisors, which in the mouse are highly developed. 2-10 and 2-12).

Please contact the moderators of this subreddit if you have any questions or concerns. The tympanic bullae are often severely affected.

The disease may be seen in other breeds, such as the Pyrenean mountain dog, Shetland sheepdog, Labrador retriever, Great Dane, English bulldog, Doberman pinscher, and boxer.

Obtain survey radiographs of the skull and mandible, including oblique, dorsoventral, and lateral views, to assess the extent of the disease. It is a deep endocranial groove marking the posterior extension of the sagittal sinus, a major blood drainage pathway from the brain. Existing lamellar bone undergoes resorption and replacement by new, woven bone. Lisa Forrest, in Textbook of Veterinary Diagnostic Radiology (Seventh Edition), 2018, Craniomandibular osteopathy (CMO) is a proliferative bone disease that occurs mainly in young West Highland white, Scottish, Cairn, Boston, and other terriers.196 It is occasionally seen in non-terrier breeds, such as the Labrador retriever, Doberman pinscher, and bullmastiff.197 There is a known autosomal recessive inheritance in West Highland white terriers.198 CMO is usually seen in young dogs aged 3 to 8 months; affected dogs have mandibular swelling, prehension difficulties, pain on opening the mouth or with mastication, pyrexia, or combinations of these clinical signs.196, Radiographically, there is irregular new bone formation in affected areas, primarily the mandible, the tympanic bulla, and the petrous temporal bone (Fig. Prognosis is guarded when excessive bony proliferation of the bullae and mandible causes pain and poor condition. Decreased range of motion is present in the temporomandibular joint.

Abnormalities noted in otitis can also be seen associated with neoplasia or osteomyelitis. The mosaic of reversal and resting lines resulting from this cellular activity bears some resemblance to the changes seen in Paget's disease of humans, but further comparison is unjustified. The cause of craniomandibular osteopathy is not known. With early lesions, however, swellings may not be very radiopaque.

The full extent of the bone changes is best demonstrated in radiographs and macerated specimens (Fig.

Ataxia has been reported in approximately 25% of cases with enlarged foramen magnum. Surgical management (subtotal occipital craniectomy, dorsal laminectomy of first cervical vertebra and durotomy to relieve obstruction) may be indicated for dogs with progressive signs (Dewey et al., 2005). R. Shane Tubbs, ... Marios Loukas, in Nerves and Nerve Injuries, 2015. Partial or complete regression of bony lesions occurs, but moderate or severe cases result in permanent bone proliferation to varying degrees. The muscle is covered by a strong fascial sheet and supplied by the superficial temporal artery. Squamous part; 7: Temporal bone.

I’m not sure how these girls were able to breathe, sit, or walk upstairs. I texted the vet and he thought he probably hit his head and it is simply a hematoma. Craniomandibular osteopathy is a proliferative, nonneoplastic lesion affecting bones of the head, in particular of the tympanic bullae (see Chapter 16 for more detail).

B) Mediolateral radiography. 1: Temporal bone; 2: Occipital bone; 3: Zygomatic process; 4: Parietal border; 5: Frontal border; 6: Sphenoidal margin; 7: Petrosquamous fissure; 8: Occipital process; 9: Retrotympanic process; 10: Parietal margin; 11: Mastoid border; 12: Occipital condyle; 13: Basilar part; 14: Pharyngeal tubercle; 15: Tympanic bulla; 16: External acoustic meatus; 17: Muscular process; 18: Malleus; 19: Mastoid process; 20: Groove for stapedial artery; 21: Groove for occipital artery; 22: Facial canal; 23: Vestibular (oval) window; 24: Cochlear (round) window; 25: Mastoid foramen; 26: Promontory. Nancy McLaughlin, ... Sheri K. Palejwala, in Principles of Neurological Surgery (Third Edition), 2012. The significance of this mosaic pattern is easily overemphasized because the mandible of growing dogs is a site of intense bone modeling as teeth mature, erupt, and drift during normal development. Dorsal view of isolated bones. 3D volume reformat of a CT of skull of a dog with occipital dysplasia (dorsoventrally elongated foramen magnum or "keyhole" foramen) and relatively normal occipital condyles (green overlay). Pain is detected when manually opening the animal's mouth and on deep palpation of affected flat bones. Dogs may be febrile during the period of bone proliferation.

CRANIOMANDIBULAR OSTEOPATHY. Once the foramen lacerum is identified, the position of the ICA is secured. B) Ethmoid bone inside the skull. Radiographically, this may give the appearance of an enlarged foramen.

Richard Câmara, Christoph J. Griessenauer, in Nerves and Nerve Injuries, 2015. The first cervical vertebra may be shortened, and there may be hypoplasia and nonfusion of the odontoid process (dens). 2-19). Ossification of soft tissues, especially near the angular processes of the mandibles, may result in fusion of the processes to the bullae and ankylosis. The lateral area receives information from the cerebral cortex. Craniomandibular osteopathy (Fig.

I need help, what should i do in this situation, please read. If the enhancement is limited to the canal, it is possible to be more confident in a diagnosis of otitis than when the enhancement extends out of the canal, such as in cases of neoplasia.

In the mouse, the interparietal bone is well developed and is visible from outside the skull, which is rare in other mammals. The occurrence of craniomandibular osteopathy is infrequently reported in the literature.

The two main fissures of the anterior lobe of the cerebellar body correspond to the precentral fissure and preculminata of the human cerebellum. History: Over the last week or so we have noticed a swollen occipital bone (the angular bone at the back of the skull) on our dog. Care should be taken as one approaches the hypoglossal canal, which will be located immediately lateral in the superior portion of the condyle emerging from the skull at 2 (left) and 10 o’clock (patient’s right).