Bursting the Bubble: Spontaneous Pneumothorax Secondary to Pneumocystis jirovecii Pseudocysts in a Young Diabetic Patient

<i>Pneumocystis jirovecii</i> pneumonia (PJP) is a well-known opportunistic infection in HIV-infected patients, but remains rare and often under-recognized in type 1 diabetic (T1D) patients. We report the case of a young woman with poorly controlled T1D, HIV-seronegative, who developed severe PJP complicated by spontaneous pneumothorax and reversible pulmonary pseudocysts. The diagnosis was confirmed by PCR on induced sputum. The patient received treatment with trimethoprim-sulfamethoxazole, corticosteroids, and thoracic drainage for pneumothorax management, resulting in progressive clinical improvement. This atypical clinical presentation illustrates the diagnostic and therapeutic challenges in this at-risk population. This case highlights the importance of suspecting PJP in T1D patients presenting with acute respiratory failure, even in the absence of classical immunosuppressive factors, and underscores the need for close monitoring of cystic complications to prevent potentially severe pneumothoraces.