The major differentials for 'cavitating pulmonary nodules with halo sign' ie., perilesional GGO are :
1. Angio-invasive infections like Invasive Aspergillosis.
2. Wegener's Granulomatosis.
3. Hemorrhagic Metastases.
4. Carcinomas (BAC and Squamous Cell Carcinoma) and Lymphoma.
These perilesional GGOs may represent hemorrhage or cellular infiltration.
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