Intra- and Extra-articular Features of Temporomandibular Joint Ankylosis in the Cat (Felis catus)

This study sought to characterize the intra- and extra-articular features of naturally occurring TMJ ankylosis in cats. TMJs from client-owned cats (n = 5) that underwent bilateral TMJ gap arthroplasty were examined and compared with TMJs from healthy, age-matched feline cadavers (n = 2) by cone-beam computed tomography (CBCT), micro-computed tomography (μCT) and histologically. Features of bilateral intra- and extra-articular ankylosis compounded by degenerative joint lesions were identified radiographically and histologically in all affected cats. Features of TMJ ‘true’ ankylosis included variable intracapsular fibro-osseous bridging, degeneration of the disc and the articular surfaces, narrowing of the joint space and flattening of the condylar process of the mandible. Extra-articular features of TMJ ankylosis included periarticular bone formation and fibro-osseous bridging between the mandible, zygomatic arch and coronoid process. In addition, subchondral bone loss or sclerosis, irregular and altered joint contours and irregularly increased density of the medullary bone characterized the degenerative changes of the osseous components of the TMJ. Complex radiological and histological features of both ankylosis and pseudoankylosis were identified that clinically manifested in complete inability to open the mouth.Graphical abstract
Source: Journal of Comparative Pathology - Category: Pathology Source Type: research

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This retrospective study included eight patients with chronic and habitual dislocations of the temporomandibular joint (TMJ), who were admitted to our institution, between 2006 and 2018. Radiographic examination involved three-dimensional computed tomography to ascertain the height of the articular eminence. Preoperative assessment included a thorough recording of history, physical examination, and assessment of the type of dislocation; we also recorded the patients ’ age, sex, and frequency of the recurrences of the dislocations.
Source: The British Journal of Oral and Maxillofacial Surgery - Category: ENT & OMF Authors: Tags: Technical note Source Type: research
ConclusionAssociations exist between upper cervical spine characteristics and treatment outcomes in TMD patients, suggesting such parameters as a possible radiographic index in TMD diagnosis and treatment.
Source: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology - Category: ENT & OMF Source Type: research
AbstractA case of tophaceous pseudogout (i.e., calcium pyrophosphate dihydrate crystal deposition disease) in the temporomandibular joint (TMJ) extending into the cranium is reported. A 59-year-old woman was referred to hospital with swelling and pain in the left cheek, and with trismus. Computed tomography imaging revealed a large, granular, calcified mass surrounding the left condylar head, partly destroying the cortex of the condylar head, and extending into the cranium by destroying the glenoid fossa. Magnetic resonance imaging revealed that the soft-tissue mass was of low-signal intensity on T1- and T2-weighted images...
Source: Oral Radiology - Category: Radiology Source Type: research
DiscussionRadiographically, 2-D imaging is adequate to establish an initial radiographic diagnosis. However, more advanced modalities (computed tomography/magnetic resonance imaging [CT/MRI) are indicated to better evaluate the orientation of the tumor and assist in the surgical management. The 3-D imaging of the 3 cases presented here emphasize this point. Positron emission tomography/fluorodeoxyglucose (PET/FDG) imaging has also been recommended for specific cases. MRI may overestimate tumor aggressiveness secondary to the influence of bone marrow and soft tissue edema. The recognition of an osteochondroma is significant...
Source: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology - Category: ENT & OMF Source Type: research
ConclusionsBasal ganglia calcification is more frequently seen in young patients with Down syndrome and may be related to the premature aging characteristic of Down syndrome.
Source: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology - Category: ENT & OMF Source Type: research
Conclusions: PET/CT images provide unique quantitative information that cannot be obtained from any other imaging modalities.
Source: Quintessence International - Category: Dentistry Source Type: research
This article presents two patients with radiographic diagnosis of vertebral artery disease. In case 1, the large field of view CBCT volume was obtained for evaluation of the temporomandibular joints. A curvilinear high-density structure was seen within the left transverse foramen of C3. Based on the density, location, and shape, a radiographic diagnosis of calcified atheromatous plaque was made. The patient was referred to her physician for management. In case 2, irregularly shaped, small, high-density structures were noted on the CBCT examination close to the left carotid bifurcation at the level of C3–C4. It was al...
Source: Journal of Orofacial Sciences - Category: Dentistry Authors: Source Type: research
This study was approved by the Animal Experimental Ethics Committee of Southern Medical University, Guangzhou, China (2014-024). All experiments were performed under protocols to meet the requirements of the Association for Assessment and Accreditation of Laboratory Animal Care International and the Experimental Animal Center of Southern Medical University. Male cynomolgus monkeys (Macaca fascicularis) were used, preliminary power analysis being performed to get the proper sample size for three groups (G∗Power 3.1, Heinrich-Heine-Universität Düsseldorf, Germany; alpha = 0.05, power = 0.95; total N = 20 hem...
Source: Frontiers in Physiology - Category: Physiology Source Type: research
Conclusion(s)MRI and arthroscopic technique could be the first choice in the diagnosis and treatment of SC. Most cases were in stage 3 of the disease at the first visit. Low recurrence rate may be attributed to the improvement of intra-articular environment after surgery. Larger sample sizes are needed for further study.
Source: Journal of Cranio Maxillofacial Surgery - Category: ENT & OMF Source Type: research
ConclusionsThe 4 hallmark radiographic findings for an aberrant ICA are an enlarged inferior tympanic canaliculus (ITC), an enhancing hypotympanic mass, an absent vertical segment of the ICA, and dehiscence of the cortex covering the tympanic portion of the ICA.4 Because of the lack of soft tissue/vascular contrast on a CBCT image, only an enlarged ITC and dehiscence of the cortex were seen in this study. Aberrant ICAs are known to cause tinnitus, which can mimic symptoms of a temporomandibular disorder (TMD).5 Because the patient was lost to follow-up, these findings could not be correlated clinically. However, it is impo...
Source: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology - Category: ENT & OMF Source Type: research
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