Markerless registration approach using dynamic touchable region model

xlomafota13 shared this article with you from Inoreader Markerless registration approach using dynamic touchable region model Via The International Journal of Medical Robotics and Computer Assisted Surgery Abstract Background Markerless registration is required for image-guided surgery; it has limited accuracy due to the ambiguity of the correspondence point set. In this study, we proposed a registration framework to improve registration accuracy for markerless registration using a dynamic touchable region model (DTRM). Methods The DTRM is defined using the geometric characteristics of the surface around the fiducial area using Intrinsic Shape Signature (ISS) keypoints. The new registration procedure, which combines the DTRM with iterative closest point-based registration (ICDTP) was implemented and verified with phantom experiments for a single-user and multi-user study. Results The ICDTP registration framework provides improved performance over the paired-point registration for surgeries, where it is inappropriate to construct the corresponding positions with adhesive fiducial markers. Conclusion The proposed method can be an alternative approach for image-guided surgery in operations for which it is not appropriate to set up markers for registration. This article is protected by copyright. All rights reserved. View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Laryngeal schwannoma: A case report and literature review

xlomafota13 shared this article with you from Inoreader Laryngeal schwannoma: A case report and literature review Via ear nose throat Ear Nose Throat J. 2022 Jan 29:1455613221075225. doi: 10.1177/01455613221075225. Online ahead of print. ABSTRACT Laryngeal schwannomas are rare benign neurogenic tumors of the larynx. They cannot be detected in the early stages because disease onset is asymptomatic. This case of laryngeal schwannoma provided a reference for clinical diagnosis and treatment strategy. A 24-year-old man presented with a 3-year history of hoarseness and sore throat for 6 months. Laryngoscopy and computed tomography showed submucosal bulging of the right ventricular fold in the right paraglottic space. The patient underwent tracheotomy first, followed by laryngotomy. The edema of the laryngeal mucosa was significantly alleviated, with normal movement of the bilateral vocal cords on the 10th day after surgery. The tracheal tube was removed at the time of discharge. The hoarseness had disappeared at the end of the first month after surgery. The effective treatment of laryngeal schwannoma involves complete resection with surgery while protecting the integrity of the larynx and restoring laryngeal function. The indication for surgery should be strictly controlled to avoid damage to the mucosa and structures of the larynx. PMID:35098768 | DOI:10.1177/01455613221075225 View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Complications Encountered with ETV in Infants with Congenital Hydrocephalus

xlomafota13 shared this article with you from Inoreader Complications Encountered with ETV in Infants with Congenital Hydrocephalus Via leak of cerebrospinal fluid Neurol India. 2021 Nov-Dec;69(Supplement):S520-S525. doi: 10.4103/0028-3886.332252. ABSTRACT BACKGROUND: Hydrocephalus is an abnormal excessive accumulation of cerebrospinal fluid (CSF) in the cavity and spaces of the brain. Endoscopic third ventriculostomy (ETV) has been an established treatment modality for congenital hydrocephalus. However, in very young infants, the results are challenging. In our study, we have evaluated whether ETV really offers an acceptable complication-free postoperative course. OBJECTIVE: To study the complication and mortality rate in infants having congenital hydrocephalus treated with ETV. MATERIALS AND METHODS: This is a single-center prospective study conducted at the Department of Neurosurgery, K. G. M. U, Lucknow, from January 2019 to February 2020. We studied 40 infants presenting with clinical and radiological features suggestive of congenital hydrocephalus. Follow-up was done at the first, thir d, and sixth months after discharge. RESULTS: Nineteen infants (47.5%) required a second CSF diversion procedure at 6 months of follow-up. The failure rate was significantly higher in infants less than 3 months of age (P value of 0.04). The ETV site bulge was the most frequent complication encountered in the postoperative period, occurring in 20% of the cases. Eventually, all these infants required a ventriculoperitoneal shunt; 15% developed clinical features consistent with the diagnosis of post-ETV meningitis. The ETV site CSF leak occurred in 10% of the patients. Subdural hygroma developed in 7.5% of the patients; 17.5% of the patients contributed to mortality with a mean time of expiry of 22 days post-procedure. All these deaths had multifactorial causes and could not be said as a complication or failure of ETV. CONCLUSION: We do not recommend ETV for infants less than 3 months because of a high failure rate. The ETV site bulge was the most reliable and earliest mark er of failure and a second CSF diversion surgery should be immediately considered. PMID:35103011 | DOI:10.4103/0028-3886.332252 View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Symptomatic Lingual Thyroglossal Duct Cyst in Children: A Laryngomalacia Phenotype

xlomafota13 shared this article with you from Inoreader Symptomatic Lingual Thyroglossal Duct Cyst in Children: A Laryngomalacia Phenotype Via otol rhinol Ann Otol Rhinol Laryngol. 2022 Jan 31:34894221075082. doi: 10.1177/00034894221075082. Online ahead of print. ABSTRACT OBJECTIVES: Patients with lingual thyroglossal duct cyst (TGDC) can present as symptomatic with obstructive airway and feeding difficulties. METHODS: We present 3 cases of symptomatic lingual TGDC. RESULTS: All 3 patients were diagnosed with laryngomalacia and underwent further concurrent or delayed airway intervention, in addition to cyst removal . CONCLUSIONS: We reason that there is a phenotype of laryngomalacia in the symptomatic lingual thyroglossal duct cyst patients who present with symptoms due to disruption in laryngeal anatomy rather than the cyst itself causing obstructive symptoms. Distinguishing this phenotype, especially in comparison to other pathologies such as vallecular cysts, may better allow for planning of concurrent or delayed airway procedures and overall counseling of parents. PMID:35100842 | DOI:10.1177/00034894221075082 View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.

Sino-nasal hemangiopericytoma: a case series and systematic literature review

xlomafota13 shared this article with you from Inoreader Sino-nasal hemangiopericytoma: a case series and systematic literature review Via http://link.springer.com/journal/405,European archives of oto-rhino-laryngology,The European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino Eur Arch Otorhinolaryngol. 2022 Feb 1. doi: 10.1007/s00405-021-07239-w. Online ahead of print. ABSTRACT BACKGROUND: Hemangiopericytoma is a rare tumor of the sino-nasal tract. Its clinical behavior is controversial. Whereas some describe an indolent course, others consider it to be an aggressive lesion with a tendency toward rapid local recurrence. Here, we describe our experience in the management of sino-nasal hemangiopericytoma (SN-HPC), comparing our experience with the current literature, and evaluating signs and tools to improve diagnosis and treatment. METHODS: All cases of SN-HPC between 2010 and 2020 were extracted and reviewed from our institutional electronic medical records. SN-HPC cases from PubMed and EMBASE between 2010 and 2020 were analyzed in a systematic literature review using the preferred reporting items for systematic review and meta-analysis (PRISMA) guidelines. Data regarding demographics, presentation, d iagnosis, treatment, and outcome were collected. RESULTS: We identified four cases of SN-HPC in the nasal cavity in our institution and an additional 53 cases in previous reports. The mean age at the time of diagnosis was 59 years, with a 1.2:1 male to female ratio. SN-HPC mostly appears unilaterally, arising in the ethmoid sinus (42.1%). The most common presenting symptoms were epistaxis (47.3) and nasal obstruction (47.3%). Both computed tomography (CT) and magnetic resonance imaging (MRI) were required for diagnosis and for tailoring the treatment plan. Endoscopic surgical excision was used in 85.9% of the patients, and in 15.7%, an additional preoperative embolization was performed, which was associated with septal necrosis in one patient (2.6%). The recurrence rate was 7%. CONCLUSION: Although previous reports attribute an aggressive tumoral behavior to SN-HPC, our experience and the literature review support a more indolent course with low recurrence rates followin g complete endoscopic resection. Preoperative embolization can be useful in certain cases, but due to potential complications, it should not be routinely indicated. PMID:35103868 | DOI:10.1007/s00405-021-07239-w View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.