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https://www.selleckchem.com/ 03). The most common mechanism of trauma was mechanical fall, but it was observed less frequently compared with the pre-COVID-19 period (61.4% vs. 40.8; P= 0.03). Subdural hematoma, traumatic subarachnoid hemorrhage, and intracerebral contusion accounted for the most common pathologies in both periods. Nonoperative management was selected for most patients (79.2 vs. 87.8%, P= 0.201) in both periods. A decrease in the frequency of neurotraumas was observed during the COVID-19 crisis concomitant with the increase in COVID-19 patients in the city. This trend began after the cancellation of nonessential activities and implementation of social distancing recommendations. A decrease in the frequency of neurotraumas was observed during the COVID-19 crisis concomitant with the increase in COVID-19 patients in the city. This trend began after the cancellation of nonessential activities and implementation of social distancing recommendations. Lung carcinoma metastasizing to a skull base meningioma remains an extremely rare phenomenon, with only 3 studies reported. Furthermore, no documented cases have been reported in the petroclival region. Thus, we have presented the first 2 cases of tumor-to-tumor metastasis (TTM) in which a petroclival lesion, initially thought to be purely meningioma, was also found to contain metastatic lung adenocarcinoma. We present the cases of 2 patients with a known history of lung adenocarcinoma and stable petroclival meningioma who had presented with new-onset neurologic deficits. Repeat imaging studies for both patients found an increased lesion size and peritumoral enhancement; thus, both patients underwent emergent craniotomy for complete lesion resection. Intraoperatively, both lesions had zones of markedly different tumoral texture. On histologic analysis, both lesions showed metastatic lung adenocarcinoma contained within the primary petroclival meningioma. Skull base TTM is a rare entity for which no specific m

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