ABSTRACT
Background: Pneumatisation of various bones around the nasal cavity results in the formation of paranasal sinuses. Varying degrees of pneumatisation result in multiple variations of paranasal sinuses some of which are important from clinical, pathological and surgical perspective. Objective: Determining the prevalence of various sinonasal anatomical variations on multi-detector computed tomography. Materials and methods: 852 patients with various symptoms of active rhinosinusitis were subjected to non-contrast enhanced CT examinations of the paranasal sinuses and nasal cavity. Multi-planar reconstructions were done in axial, coronal and sagittal plane and the reconstructed CT images were evaluated for the presence of anatomic variants of the sinonasal cavities and the prevalence of each variant was calculated. Results: Deviated nasal septum (DNS) was the most common anatomic variant of the paranasal sinuses and nasal cavity seen in 724 patients (85%), if minimal septal deviation (<1 mm) was also taken into account. The second most common variant was prominent ethmoid bulla which was present in 392 of 852 patients (46%). Dehiscent lamina papyracea (0.9%) and pneumatised crista galli (11.7%) were the least commonly seen sinonasal anatomic variants. Conclusion: Sinonasal anatomic variants are a rule rather than an exception, being present in a majority of population. These variations should be diagnosed and documented on CT examinations of paranasal sinuses to avoid any unforeseen complication during functional endoscopic sinus surgery and other skull base surgeries.
ABSTRACT
The shoulder socket is called the glenoid fossa This socket is shallow and is part of the scapula (shoulder blade) The surface of the humeral head and the inside of the fossa are covered with articular cartilage The glenohumeral joint consists of an articulation between the scapula and humerus Retroversion angle of humeral head (or retrotorsion angle, RA) is an important parameter in total shoulder arthroplasty and is one of these important reference factors which can influence the outcomes of total shoulder arthroplasty This study was undertaken to evaluate the correlation between retroversion angle of humeral head and position of intertubercular sulcus The present study is a prospective one which was conducted in the Department of Radiodiagnosis and Imaging at Government Medical College and Hospital, Srinagar The 60 dry adult humeri were analyzed by multiplanar computed tomography (CT) CT data were transferred to a workstation (Silicon Grafics; Sunnyvale, CA) for multiplanar CT-reformation The mean retroversion angle of the humeral head in relation of the transe-picondylar axis was 123 degree The mean ITS orientation was 407 degree The Pearson correlation coefficient between the retroversion of the humeral head and the ITS orientation was -037 There was an inverse correlation between the retroversion of the humeral head and the ITS orientation This variation is due to several factors, including the definition of humeral head retroversion, different methods of measurement, ranges of normal values, and accuracy of anatomic landmarks to guide determination of anatomic retroversion Humeral head retroversion is generally defined with respect to the plane of the humeral head articular surface proximally; distally, however, Yassar Shiekh, Aamir Javed Khan, Mohammad Iqbal Bhat A CT scan anatomical study correlating between the retroversion of the humeral head and the orientation of the inter-tubercular sulcus IAIM, 2018; 5(12): 96-101 Page 97 the reference axis has been debated, including the transepicondylar axis, trochlear tangent axis and forearm axis The study concludes that there is a reverse correlation between the retroversion of the humeral head and the orientation of the intertubercular sulcus