Eggshell calcification after intrathyroidal hemorrhage of retrosternal thyroid

We report a rare event of old hemorrhage into a thyroid causing respiratory distress. A 67-year-old man with chronic cough and recent dysphagia was found to have a retrosternal mass extending into the visceral mediastinum on chest roentgenogram. A computed tomographic (CT) scan confirmed eggshell callcification, which was 53 × 53 × 80 mm in size a retrosternal thyroid mass and revealed significant tracheal deviation to the right due to an extensive mass surrounded by a calcificated capsule in the left lobe of the thyroid gland with extension to the upper mediastinum. He successfully underwent left lobectomy of the thyroid gland with sternotomy. The pathological examination revealed intrathyroidal hemorrhage of the thyroid gland with massive intracystic old bleeding

Biomechanical Analysis of Interbody Device in Calf Corpectomy Model

Introduction: The aim of this study is to evaluate the biomechanical properties of the interbody device which is used in thoracic trauma, infection and tumor surgery in valf model. The comparison in between anterior interbody application, anterior, posterior and anterior posterior instrumentation combinations is also stated. The statical applications of interbody device in conditions with anterior interbody applications, anterior, posterior and anterior+posterior instrumentation combinations are done through the gain of stiffness and displacement. In this biomechanical study, instrument stiffness and displacement values are measured and evaluated under axial loading

Morphologic evaluation of cervical and lumbar facet joints: intra-articular facet block considerations.

STUDY DESIGN: Needle orientations for lumbar and cervical facet injection were measured in cadavers and compared with facet angles measured on magnetic resonance images (MRIs). OBJECTIVES: To establish facet orientation relative to clinical procedures of a facet joint block in the cervical and lumbar spine. METHODS: Needle orientation angles were measured from 20 unembalmed human cadaveric specimens (13 cervical and 7 lumbar). Spinal needles were inserted into the midpoints of the facet joint spaces from C3 to C7 and L1 to L5. Needle trajectories were measured with an optical tracking system. For comparison, facet angles from 100 clinical MRIs of lumbar spines were also measured. Facet orientations on MRIs were measured at their intersection with the transverse plane, and angles were quantified using image analysis software. RESULTS: Typical angles for insertion of the needle into the cervical facets were oriented closer to the coronal plane, whereas insertion angles for lumbar needles were oriented closer to the sagittal plane. Relative to the sagittal plane, the mean cervical angle was 72 degrees and the mean lumbar angle was 33 degrees. The insertion points of the cervical facets were a mean of 29 mm from the midsagittal plane compared with a mean of 22 mm for the lumbar facets. MRI-based facet joint angles correlated poorly with actual injection angles, which were overestimated 5 to 23 degrees, depending on the lumbar level. CONCLUSIONS: Knowledge of the quantitative anatomy of the facets may help improve clinical diagnosis and treatment. These data also may aid in constructing more realistic computer simulations

A Rare History: an Intracranial Nail Present for Over a Half-Century

We present a rare case of a patient with a persistent headache for many years found to have an intracranial nail present for nearly 65 years. The nail was found entering approximately 1 cm from the midline on the left side, passing below the superior sagittal sinus, with the tip 1.5 mm right of the frontal horn of the lateral ventricle. Treatment strategies designed to optimize outcome for intracranial foreign bodies and possible complications are discussed in this report. We also discuss the decision for surgical intervention for foreign bodies and the relevance of position of the foreign body

Feasible and accurate occipitoatlantal transarticular fixation: an anatomic study.

BACKGROUND: Defining the anatomic zones for the placement of occiput-C1 transarticular screws is essential for patient safety. OBJECTIVE: The feasibility and accuracy of occiput-C1 transarticular screw placement were evaluated in this anatomical study of normal cadaveric specimens. MATERIAL AND METHODS: Sixteen measurements were determined for screw entry points, trajectories, and lengths for placement of transarticular screws, as applied in the technique described by Grob, on the craniovertebral junction segments (occiput-C2) of 16 fresh human cadaveric cervical spines and 41 computed tomographic reconstructions of the craniovertebral junction. Acceptable angles for screw positioning were measured on digital x-rays. RESULTS: All 32 screws were placed accurately. As determined by dissection of the specimens, none of the screws penetrated the spinal canal. Screw insertion caused no fractures, and the integrity of the hypoglossal canal was maintained in all the disarticulated specimens. CONCLUSION: Viable transarticular occiput-C1 screw placement is possible, despite variability of the anatomy of the occipital condyle