Fungal abscess of left lung.
Cavitary lesions can be due to infection, tumor, infarction, trauma, and other entities.
In this case, it was infection. The secondary form of HOA is the best known, and is so called because it is generally associated with various malignancies or chronic infections of the lung or pleura. Because of this association, an earlier name for this syndrome was hypertrophic pulmonary osteoarthropathy. However, since the primary site of disease may lie elsewhere, such as the gut, cardiovascular, hepatobiliary, and endocrine systems, this designation has fallen into disuse, and the term hypertrophic osteoarthropathy is now preferred. There is now strong evidence that hypertrophic osteoarthropathy and clubbing is due to the peripheral impaction of megakaryocytes and platelet clumps in the fingers and toes.