BackgroundComplete rupture of the anterior cruciate ligament (ACL) does not represent a diagnostic problem for the standard magnetic resonance (MR) protocol of the knee. Lower accuracy of the standard MR protocol for partial rupture of the ACL can be improved by using additional, dedicated MR techniques. The study goal was to draw a comparison between sagittal-oblique MR technique of ACL imaging versus flexion MR technique of ACL imaging and, versus ACL imaging obtained with standard MR protocol of the knee.Patients and methodsIn this prospective study we included 149 patients who were referred to magnetic resonance imaging (MRI) examination due to knee soft tissues trauma during 12 months period. MRI signs of ACL trauma, especially detection of partial tears, number of slices per technique showing the whole ACL, duration of applied additional protocols, and reproducibility of examination were analysed.ResultsAccuracy of standard MRI protocol of the knee comparing to both additional techniques is identical in detection of a complete ACL rupture. Presentations of the partial ruptures of ACL using flexion technique and sagittal-oblique technique were more sensitive (p<0.001) than presentation using standard MR protocol. There was no statistically significant difference between MRI detection of the ruptured ACL between additional techniques (p> 0.65). Sagittal-oblique technique provides a higher number of MRI slices showing the whole course of the ACL and requires a shorter scan time compared to flexion technique (p<0.001).ConclusionsBoth additional techniques (flexion and sagittal-oblique) are just as precise as the standard MR protocol for the evaluation of a complete rupture of the ACL, so they should be used in cases of suspicion of partial rupture of the ACL. Our study showed sagittal-oblique technique was superior, because it did not depend on patient’s ability to exactly repeat the same external rotation if standard MR protocol was used or to repeat exactly the same flexion in flexion MR technique in further MR examinations. Sagittal-oblique technique does not require the patient’s knee to be repositioned, which makes this technique faster. We propose this technique in addition to the standard MR protocol for detection of partial ACL tears.

It is not possible to distinguish conventional, ie intraosseous, ameloblastoma from malignant ameloblastoma according to histopathologic features. It is necessary to pay special attention, especially in elderly patients, and to carry out further clinical, radiological and pathohistological diagnostic procedures, such as immunohistochemical analysis. A timely and correct diagnosis and treatment of malignant ameloblastoma require a multidisciplinary approach.

Endocranial bone lesions have attracted intensive scientific debate on their aetiology. In recent literature, the lesions were almost exclusively interpreted as of infectious origin. In this paper, we give new insight into the aetiology of endocranial lesions, distinguishing the lesions of vascular origin from those caused by tuberculosis or other conditions. The analysis is based on a rare case of a young female individual who displayed multiple endocranial lesions with 'serpens endocrania symmetrica' morphology. The lesions were associated with an uncommon branching pattern of the middle meningeal artery and marked side differences in teeth pathology. Postcranial skeleton showed signs of the left upper limb weakness. The macroscopic finding of the endocranial lesions along with the skeletal evidence of neurological damage, together with characteristic radiological and histological features, can lead to diagnosis of arteriovenous malformations. This study aims to improve understanding of the aetiology of endocranial bone lesions.

Tumors of the mediastinum represent a very heterogeneous group of primary and metastatic tumors. Most tumors of the mediastinum are detected on chest radiography, but for more precise view additional imaging methods are necessary. The most common causes of tumor mass in anterior mediastinum are thymoma, germ cell tumors, retrosternal goitre and Hodgkin's lymphoma. In the middle mediastinum most commonly tumors are congenital cysts, such as bronhogenic and pericardial cysts, and enlarged lymph nodes, while in the posterior mediastinum dominantly present neurogenic tumors. Complex anatomy of mediastinum infrequently makes difficulties in radiological diagnosis of these tumors. Computerized tomography (CT) is a radiological method of choice in the diagnosis of primary and/or secondary mediastinal lesions. Localization and structure of the tumor masses are very important for diagnosis. Knowledge of anatomy, with the standard topographic divisions on the anterior, middle and posterior mediastinum is necessary prerequisite for a valid CT diagnostic. Lesions in all parts of the mediastinum are systematically presented from the aspect of practical recommendations, with a view of the typical pathological findings.

Background/Aim. This study aimed to examine the correlation of CBCT analysis derived bone density with primary stability value. Methods. Clinical prospective experimental study was conducted in 38 healthy patients missing one tooth in the lateral region. It was planned to install Bredent Blue Sky Narrow self-taping dental implants with dimensions 3.5 x 10 mm. During preoperative preparation, a CBCT scan was performed on Planmeca apparatus, followed by pre-implantation measurements and planning in the CBCT apparatus software (Romexis). The mean value of the average bone volume is automatically generated and expressed in Hounsfield units. Upon implant placement, we performed measurements of the primary implant stability using Osstell apparatus. Results. Of the thirty-eight patients included in the study, there were 68.4% male patients and 31.6% female patients. The arithmetic mean of the measured bone density of all subjects in the study amounted to 536.2 HU. The arithmetic mean of dental implant primary stability for all subjects in the study was 68.7 ISQ. There is statistically significant strong positive connection between HU and ISQ (r = 0.744, p <0.001). Higher HU values are connected to higher ISQ values. In the multivariate linear regression model, statistically significant predictors of higher ISQ values are as follows: male (B = 4.669; p = 0.047) and higher HU values (B = 0.032; p <0.001). Conclusion. We have shown in our clinical study that there is a statistically significant strong positive correlation between the bone density expressed in HU units measured in the software of the CBCT device and the primary stability of dental implants expressed in ISQ units.