18F-FDG avid Sclerosing Angiomatoid Nodular Transformation (SANT) of spleen on PET-CT — a rare mimicker of metastasis

Sclerosing Angiomatoid Nodular Transformation (SANT) is a rare benign vascular tumor of spleen. It consists of multiple angiomatoid nodules surrounded by dense fibrous tissue that often coalesces centrally to form a scar, which is considered to be a characteristic feature. These are usually asymptomatic and incidentally detected on imaging for other underlying pathology. SANTs can be 18F-Fluorodeoxyglucose (18F-FDG) avid on positron emission tomography-computed tomography (PET-CT) and thus can lead to false positive finding in oncological patients

Fever of Unknown Origin — infected Fistula-in-Ano as the focus on 18F-FDG PET-CT

Fever of Unknown Origin (FUO) is a vexing clinical problem. Diagnosis of aetiology is essential for definitive management.A wide array of infective, inflammatory, malignant and miscellaneous pathologies can cause FUO. Hybrid imaging with18F-Fluorodeoxyglucose (18F-FDG) positron emission tomography-computed tomography (PET-CT) is now an integral part ofFUO management because of its ability to demonstrate the cause in a large proportion of cases. The authors present the caseof a 42-year-old male, where an infected fistula-in-ano was detected as the cause of FUO on 18F-FDG PET-CT

Outcome analysis of percutaneous tenotomy in chronic lateral epicondylitis elbow of greater than 6 months duration

Background: Lateral epicondylitis elbow is a self-limiting condition with an unclear pathology. Conservative therapy is treatment of choice in lateral epicondylitis elbow but chronic lateral epicondylitis elbow (>6 month) is a condition difficult to treat. Percutaneous extensor tendon release can be a viable treatment option in such conditions.Methods: This prospective study was conducted in 2016 to 2017 at the Department of Orthopaedics Surgery in a tertiary care institute. 30 patients were treated by percutaneous tenotomy.  The outcome was assessed at follow ups using numerical rating scale (NRS), disabilities of the arm, shoulder, and hand questionnaire (DASH) and Oxford scores.Results: 30 elbows were included in this study. They were managed by percutaneous method (PT; n=30). The mean age of patients was 41.74 years (range 26-67 years). Females were affected more than males in both groups (3:1).    Dominant limb was involved in 86% of patients.73% of females were house wives exposed to household chores and manual activities while 40% of males were manual workers.  Mean hospital stay was 35 minutes (range 20-43 minutes). Patients were followed up at 3 month and 6 month post intervention. NRS, DASH, Oxford score assessment showed that all the scores were significantly decreased (p<0.05) at 3 month and 6 month in patients undergoing percutaneous tenotomy. Conclusions: Lateral epicondylitis >6 month duration is difficult to treat. Percutaneous tenotomy is effective modality of treatment in such conditions

Structured eigenvalue backward errors of matrix pencils and polynomials with Hermitian and related structures

We derive a formula for the backward error of a complex number λ when considered as an approximate eigenvalue of a Hermitian matrix pencil or polynomial with respect to Hermitian perturbations. The same are also obtained for approximate eigenvalues of matrix pencils and polynomials with related structures like skew-Hermitian, *-even, and *-odd. Numerical experiments suggest that in many cases there is a significant difference between the backward errors with respect to perturbations that preserve structure and those with respect to arbitrary perturbations