Overview of Pulmonary Function Tests

Pulmonary Function Testing (PFT) is a complete evaluation of the respiratory system including patient history, physical examinations, chest x-ray examinations, arterial blood gas analysis, and tests of pulmonary function. The primary purpose of pulmonary function testing is to identify the severity of pulmonary impairment. Pulmonary function testing has diagnostic and therapeutic roles and helps clinicians answer some general questions about patients with lung disease. PFT’s are normally performed by a specialist technician.


Imaging Sign of the Day – Soft-tissue Rim Sign

Soft-tissue rim sign – helpful in distinguishing a ureteric stone from a phlebolith on CT imaging. Ureteric stones appear as a calcific density with a surrounding rim of soft tissue representing the oedematous ureteric wall (red arrow). Phleboliths on the other hand usually have imperceptible walls and therefore they appear to be surrounded by fat (green arrow). Occasionally phleboliths have a tail of remnant parent vein associated with one edge known as the comet-tail sign.

Soft tissue rim sign

%d bloggers like this: