The Pseudoalveolar Form of Sarcoidosis: A Diagnostic Trap Not to Be Ignored.

Sarcoidosis is a benign systemic granulomatosis of unknown etiology. Interstitial parenchymal involvement is typical. The pseudoalveolar form is atypical, often acute in onset, and difficult to diagnose; however, it rapidly improves with corticosteroid therapy. Here, we report a case of pseudoalveolar sarcoidosis with distinct and confusing radiological and clinical presentation in a young female patient. Through this work, we emphasize the rarity of this pseudoalveolar form, the difficulty of making an early diagnosis, and the importance of considering it early. Finally, we discuss the excellent response of this unusual form of sarcoidosis to corticosteroid therapy and the importance of starting therapy early.