The case of an 81-year old ex-smoker male diagnosed with chronic bronc
hitis and undergoing treatment for pulmonary tuberculosis who presente
d a left iliac psoas abscess of torpid evolution is herewith reported,
The detection of aerobic, anaerobic, fungal and mycobacterial microor
ganisms was repeatedly negative and was finally found to be an abscess
ed metastasis of epidermoid lung cancer, The aspects related to psoas
abscess, muscular metastasis of bronchogenic carcinoma and the associa
tion between tuberculosis and lung cancer are discussed.