Fig. 7

A 22-year-old male patient with occupational history correlated with the glass industry complained of chronic cough. A, B Axial chest CT cuts (lung window) showed bilateral peri-hilar and peripheral sub-pleural large consolidative mass-like lesions without smooth air bronchogram. C, D Axial T2WI showing the low signal intensity of the bilateral large confluent lesions. After placing two ROIs within the largest lesion and the spinal cord, the lesion-to-spinal cord signal intensity ratio was calculated = 0.6. E Axial DWI showing low signal intensity denoting non-restricted diffusion and lesion-to-spinal cord signal intensity ratio was calculated = 0.2. F ADC mapping images showing low signal intensity with minimum ADC (1.1 × 10⁻³ mm²/s) and mean ADC (1.5–1.7 × 10⁻³ mm²/s). Referring to the estimated cutoff values, T2WI L-to-SC SI ratio, DWI L-to-SC SI ratio, minimum ADC, and mean ADC suggested a benign process. Pathologically proven progressive massive fibrosis sequel to pneumoconiosis. PET/CT result was negative