Pneumoconiosis caused by inhalation of coal dust is called anthracosis. In coal workers, the most significant pathological progression is from simple coal workers' pneumoconiosis (CWP) to progressive massive fibrosis (PMF). PMF is defined radiologically as a lesion of size:

• A > 0.5 cm in diameter
• B > 1 cm in diameter ✓
• C > 2 cm in diameter
• D > 3 cm in diameter

Explanation

Simple CWP shows small rounded opacities (< 1 cm) on chest X-ray. Progressive massive fibrosis (PMF), also called complicated CWP, is defined by the development of opacities greater than 1 cm in diameter on plain chest radiography (ILO classification Category B and C). PMF can progress even after cessation of coal dust exposure and is associated with obstructive and restrictive pulmonary impairment, cor pulmonale, and accelerated mortality.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.