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Τρίτη 1 Φεβρουαρίου 2022

Markerless registration approach using dynamic touchable region model

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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.

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Symptomatic Lingual Thyroglossal Duct Cyst in Children: A Laryngomalacia Phenotype

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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

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

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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

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