Classically, metastatic tumours are solid, multiple, well-circumscribed, and rarely cavitary. This rare case of metastatic pulmonary malignant melanoma showed a ring-shaped ground-glass opacity and then the halo sign, depending on the disease progression.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6151307 | PMC |
http://dx.doi.org/10.1002/rcr2.370 | DOI Listing |
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