Ominous lung cavity “Tambourine sign”

Figure 4 Histopathology and positron emission tomography findings. A and B: Histological photomicrograph shows fragments of tumor with mucinous epithelium H and E × 40. Higher magnification (C) shows invasive mucinous adenocarcinoma with pools of extracellular mucin H and E × 400; C: Whole-body PET-CT image shows patchy mild uptake of FDG within the lung lesions. No evidence of extrathoracic primary site of malignancy is there. PET-CT: Positron emission tomography-computed tomography; FDG: 2-[fluorine-18] fluoro-2-deoxy-D-glucose.