eng Science and Education Publishing American Journal of Medical Case Reports 2374-216X 2020-07-22 8 11 394 396 10.12691/ajmcr-8-11-4 AJMCR20208114 article Arturs Balodis arturs.balodis7@gmail.com 1 2 Davis Simanis Putrins 2 Julija Dolgopolova 3 Inese Briede 4 Renars Putnins 4 Ginta Balode 5 Institute of Diagnostic Radiology, Pauls Stradins Clinical University Hospital, Riga, Latvia Department of Neurosurgery, Pauls Stradins Clinical University Hospital, Riga, Latvia Department of Pathology, Pauls Stradins Clinical University Hospital, Riga, Latvia Department of Infectology, Riga Stradins University, Riga, Latvia A 65-year-old male patient was referred to a university hospital with a skull mass and previous history of left lung carcinoma, although a left sided pneumonectomy had been performed two years ago. The large solitary extra-axial, intra- and extra-osseous skull mass exhibited uncharacteristic radiologic features that were atypical for all of the proposed differential diagnoses, which included metastasis, atypical meningioma, and osteosarcoma. An incomplete patient history also made the radiologic diagnosis more difficult. In the end a tumour excision was performed and the tissue morphology and immunohistochemical properties examined, and the diagnosis of a metastatic lung carcinoma to the skull was confirmed. http://pubs.sciepub.com/ajmcr/8/11/4/ajmcr-8-11-4.pdf skull mass metastasis lung carcinoma