The document discusses a study measuring the distance between the cochlea and internal carotid artery (cochlear-carotid interval) using both high-resolution CT scans and cadaveric dissection of human temporal bones. The study found the average interval was 2.08 mm on CT scans and 2.19 mm on dissection, with a wide range of measurements between specimens. A thin cochlear-carotid interval is an important surgical risk for cochlear implantation and may cause pulsatile tinnitus. Pre-operative imaging can help surgeons identify anatomical variations and prevent complications during cochlear implant surgery.
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[Dr. Suh's thesis in International journal SCI]
“A Novel technique for short nose correction”
The nominated thesis is about A Novel technique for short nose correction; Hybrid septal extension graft that have acquired the favorable reputation internationally based on the advanced clinical experiences.
Diagnosis of Vertical Root Fracture Using Digital Radiography, Helical Comput...iosrjce
IOSR Journal of Dental and Medical Sciences is one of the speciality Journal in Dental Science and Medical Science published by International Organization of Scientific Research (IOSR). The Journal publishes papers of the highest scientific merit and widest possible scope work in all areas related to medical and dental science. The Journal welcome review articles, leading medical and clinical research articles, technical notes, case reports and others.
A very precise and intimate description on radiographic considerations in dental implants, since the advent of the first radiographic modality in 1905, the dental health care professionals have been striving to achieve clarity & excellence in the development & usage of dental radiographic imaging modalities.
I hope this presentation will make this wonderful topic more understandable and easier to digest in the minds of young and experienced dental health care professionals.
by Dr Ishaan Adhaulia
43.Merlyn Elizabeth Monsy et al. ROLE OF CBCT IN ORAL AND MAXILLOFACIAL SURGERY – A REVIEW. International Journal of Psychosocial Rehabilitation, Vol. 24, Issue 04, 2020: 10302-10310
Reconstruction of a facial defect is a complex modality either surgically or prosthetically, depending on the site, size, etiology, severity, age, and the patient’s expectation. The loss of an auricle, in the presence of an auditory canal, affects hearing, because the auricle gathers sound and directs it into the canal.
Surgical reconstruction is preferable but prosthetic approach may be necessary in some circumstances such as the presence of complex or large defects, requirement of the recurrence control, local or general contraindications of surgery, damaged neighboring tissues due to the radiotherapy, general poor health, failed reconstructive attempts previously made, refusal of the surgery by the patient, high esthetic demands, the desire for a quick recovery and palliatively operated patients.
Nowadays, craniofacial implants are used to support and retain such prostheses. Studies have shown successful retention and stability of auricular prostheses anchored to the temporal bone with titanium implants.
Diagnosis of Vertical Root Fracture Using Digital Radiography, Helical Comput...iosrjce
IOSR Journal of Dental and Medical Sciences is one of the speciality Journal in Dental Science and Medical Science published by International Organization of Scientific Research (IOSR). The Journal publishes papers of the highest scientific merit and widest possible scope work in all areas related to medical and dental science. The Journal welcome review articles, leading medical and clinical research articles, technical notes, case reports and others.
A very precise and intimate description on radiographic considerations in dental implants, since the advent of the first radiographic modality in 1905, the dental health care professionals have been striving to achieve clarity & excellence in the development & usage of dental radiographic imaging modalities.
I hope this presentation will make this wonderful topic more understandable and easier to digest in the minds of young and experienced dental health care professionals.
by Dr Ishaan Adhaulia
43.Merlyn Elizabeth Monsy et al. ROLE OF CBCT IN ORAL AND MAXILLOFACIAL SURGERY – A REVIEW. International Journal of Psychosocial Rehabilitation, Vol. 24, Issue 04, 2020: 10302-10310
Reconstruction of a facial defect is a complex modality either surgically or prosthetically, depending on the site, size, etiology, severity, age, and the patient’s expectation. The loss of an auricle, in the presence of an auditory canal, affects hearing, because the auricle gathers sound and directs it into the canal.
Surgical reconstruction is preferable but prosthetic approach may be necessary in some circumstances such as the presence of complex or large defects, requirement of the recurrence control, local or general contraindications of surgery, damaged neighboring tissues due to the radiotherapy, general poor health, failed reconstructive attempts previously made, refusal of the surgery by the patient, high esthetic demands, the desire for a quick recovery and palliatively operated patients.
Nowadays, craniofacial implants are used to support and retain such prostheses. Studies have shown successful retention and stability of auricular prostheses anchored to the temporal bone with titanium implants.
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1. Study of agreement between
radiological and cadaveric
dissection findings of cochlear
carotid interval of human temporal
bone
Dr. R S Lakhawat, Dr. Mohnish Grover, Dr. Man Prakash Sharma, Dr.
Sunita Agarwal, Dr. Sunil Samdani.
Dept. of Otorhinolaryngology, SMS Medical College and Hospital,
Jaipur, Rajasthan
2. INTRODUCTION
Cochlear carotid interval is minimum distance between petrous
segment of internal carotid artery and basal turn of cochlea. This
very small distance leads to potential surgical hazard during
cochlear implantation and a possible source of auditory and
vestibular symptoms such as tinnitus and hearing loss.
The carotid canal is a potential space that may give tactile sensation
similar to cochlea and may mislead the CI surgeon. Preoperative
knowledge of thin or absent bone between cochlea and petrous
carotid canal may help prevent inadvertent penetration of carotid
canal during cochlear implant surgery.
3. This distance is also critical in a cochlear drill out procedure in case
of labyrinthitis ossificans.
Less than 10% of tinnitus patients suffer from pulsatile tinnitus.
It is possible that the energy transmitted from the petrous carotid
artery to the basal turn of cochlea may result in fluid pressure
changes and the direct stimulation of hair cells on basilar
membrane1.
4. In recent years the cochlear implantation surgery is getting
popularised, so this cochlear carotid interval is getting more and
more attention from CI surgeons. Inadvertent electrode insertion in
the carotid canal has also been reported2.
Our study is aimed to calculate this very distance in cadaveric human
temporal bones radiologically and on dissection.
5. Material and Methods
The present study was conducted at Department of
Otorhinolaryngology, Department of Anatomy and Department of
Radiology in SMS Medical College and Hospital, Jaipur.
40 cadaveric Human temporal bones were acquired from
department of anatomy through proper channel.
6. All specimens were initially undergone high-resolution CT scanning.
The specimens then dissected under microscope.
The carotid cochlear interval was the minimum distance between
basal turn of cochlea and the internal carotid artery. It was
measured on HRCT Temporal bone with help of DICOM viewer
software
CCI then measured on dissection by placing millimetre graph paper
in dissection field and ImageJ software was used to convert pixel to
millimetre.
8. CCI on HRCT CCI on Dissection
Mean 2.08 mm 2.19 mm
SD 0.89 mm 0.85 mm
Range 0.48 - 4.25 mm 0.85 - 4.12 mm
9. DISCUSSION
Our results were similar to Young R. J. and et al (2006) who did a study
on 59 temporal bones with help of HRCT Temporal bone and find in
their study that CCI was in right side measured with range of 0.4-3.7
mm and Mean ± SD =1.2±0.8 mm and in left side range = 0.4-4.9
mm and Mean ±SD =1.1±0.9 mm and concluded that the CCI varies
widely between patients1.
Gunbey et al (2011) in a study on 1105 patients found that the CCI
showed a range of 0.0 to 6 mm for the right side (mean 0.9 ± 0.8;)
and 0.0 to 5.9 mm for the left side (mean 1.0 ± 0.8;). They found
dehisence of the CCI 0.0 mm unilaterally in eight patients (0.7%) and
bilaterally in two (0.1%) with a score of 10 in the total population
(0.9%)3.
10. The bone thickness between otic capsule and carotid canal varies
from 0.5 to 10 mm with mean distance 1.3 to 1.5 mm.
We found in our study that the distances measured by CT and on
dissection were similar, the small differences were due to measuring
technique limitations and limited access available during dissection.
The similarity between both results indicate towards importance of
pre op HRCT, and proves the importance of the same. Pre op HRCT
TB gives an idea to the surgeon about the anatomical roadmap of the
important neurovascular structures of the temporal bone.
11. The temporal bone contains important structures in a relatively
smaller area. Hence, anatomical abnormalities and even variation in
bone thickness separating its contents become important when
surgical intervention is required. Familiar variants include facial nerve
canal dehiscent, high and or dehiscent jugular bulb.
Cochlear implant is a breakthrough in medical engineering and its
implantation surgery is increasing rapidly in popularity. The
implantation is quite safe but number of complications have been
reported , including inadvertent penetration of the electrode array in
petrous carotid canal.
So, CCI becomes important and close attention should be given to
this distance during pre op imaging.
12. CONCLUSION
The cochlea carotid interval varies widely between cadaveric
temporal bones. Attention to this area when examining pre
operative CT scan may help prevent inadvertent carotid canal
penetration during Cochlear implant surgery.
13. REFERENCES
1. Young RJ, Shatzkes DR, Babs JS, et al. The cochlear-carotid interval: anatomic
variation and potential clinical implications. Am J Neuroradiol. 2006; 27 (7): 1486-
1490.
2. Gastman B, Hirsch B, Sando I, et al. The potential risk of carotid injury in cochlear
implant surgery. Laryngoscope 2002;112:262–66.
3. Gunbey HP, Aydın H, Cetin H, Gunbey E, Karaoglanoglu M, Cay N, Alhan A. MDCT
Assessment of the Cochlear-Carotid Interval. Neuroradiol J. 2011 Jun 30;24(3):439-
43.