Organizing pneumonia may present as a mass lesion that can be confused with lung cancer.


The patient usually presents with a solitary nodule on chest X-ray or CT scan.


Clinical findings may be absent or may include:

(1) cough

(2) shortness of breath

(3) chest pain


Situations in which the diagnosis can be challenging:

(1) limited tissue sampling that shows atypical pneumocyte hyperplasia

(2) the patient has risk factors for lung cancer

(3) absence of a preceding history of aspiration or pneumonia (occult onset)

(4) positive PET scan or contrast enhancement on CT scan


A patient may undergo wedge or other limited resection, which is usually curative.


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