BackgroundOsteoid osteoma is the commonest benign osteogenic lower limb tumour with 25% involving the proximal femur 1 . A radiologist, with improvised skills on musculoskeletal imaging and its sequencing with higher imaging will greatly help in addressing the lesion and its location to narrow down the diagnosis 1,2 . However, the location of the lesion in proximal femur (intra or extracapsular) and its atypical clinical presentation sometimes surprises with tissue diagnosis warranting a biopsy at preprocedural level to establish a working diagnosis 3-6 . However, management of osteoid osteoma by techniques like computed tomography (CT) guided percutaneous radiofrequency ablation or percutaneous bone drilling have yielded promising results [7][8][9][10] . MethodA prospective case series was conducted at the Sri Ramachandra Institute of Higher Education and Research, Porur, India, from November 2016 to June 2019. All children below 18 years of age with hip pain and x-ray / CT scan suggestive of osteoid osteoma located in proximal femur, planned for percutaneous CT guided radio-frequency ablation, were included. Lesions other than proximal femur sites, different planned intervention and inconclusive diagnosis were excluded.

Background: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV2) is the causative agent for coronavirus disease 2019 (COVID-19) pandemic. While the primary organ of involvement in this disease is the lung, multiple other organ systems can be involved either due to direct viral cytopathic effects or due to thrombo-inflammation and immune system dysregulation. In this study we describe the spectrum of extrapulmonary imaging findings encountered in our patients with COVID-19.Methods: This was a retrospective observational study conducted in three tertiary care hospitals in the city of Chennai in southern India. All cross-sectional imaging studies (other than lung imaging studies) performed in patients who had proven COVID-19 infection by RT-PCR testing during the period from April 2020 to March 2021 were included as part of the study. Extrapulmonary findings in these imaging studies were recorded and collated system-wise.Results: A total of 96 non-lung imaging studies were performed in patients who had RT-PCR positivity for COVID-19 infection. Among these a total of 30 studies had extrapulmonary imaging findings. Vascular involvement was seen in 14 patients, central nervous system involvement in 13 patients, abdomen involvement in 2 patients, and cardiac involvement in 1 patient. Vascular manifestations included arterial and venous thrombosis. Neurological manifestations included stroke, encephalitis and demyelination. Abdominal manifestations included enteritis and acute kidney injury. Cardiac manifestation was in form of myocarditis.Conclusions: Extrapulmonary imaging findings in COVID-19 are uncommon but not rare. Multisystem thrombotic manifestations and central nervous system involvement account for majority of extrapulmonary imaging findings in COVID-19.