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Background Heterotopic Ossification (HO) is a common condition referring to ectopic bone formation in soft tissues. It has two major etiologies, acquired (more common) and genetic. The acquired form is closely related to tissue trauma. The exact pathogenesis of this disease remains unclear; however, there is ongoing research in prophylactic and therapeutic treatments that is promising. Conclusions Due to HO potential to cause disability, it is so important to differentiate it from other causes in order to establish the best possible management.

between INRs and IRs, but also with the wider stroke team. The results of our survey demonstrate that there is willingness in the IR community to train in MT to help deliver this service. In our own Trust, we have adopted this approach and have trained one IR to be independent in MT with two other IRs also in training. There is also recognition that in order to maintain sufficient numbers of elective cases for INRs elective a balance must be struck between enabling a full 24/7 on-call service and for each individual operator to maintain a sufficient case load to ensure a high level of expertise for other neurointerventional procedures. We believe that in order to fulfil the ambitious goal of the NHS Long Term Plan of delivering a 10-fold increase by 2022 in the proportion of patients who receive a thrombectomy that INRs and IRs must work in cooperation to provide this highly effective and life-changing treatment.

Funding and support: By Annals policy, all authors are required to disclose any and all commercial, financial, and other relationships in any way related to the subject of this article as per ICMJE conflict of interest guidelines (see www.icmje.org). The authors have stated that no such relationships exist. To the Editor:The novel coronavirus, severe acute respiratory syndrome coronavirus 2 (SARS-Cov2), is known to cause mild to severe lower respiratory disease (coronavirus disease 2019

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