title: Small-intestine pneumocystis jiroveci pseudotumor as an acquired immunodeficiency syndrome-presenting illness: report of a case and review of the literature.
abstract: A  Pneumocystis jiroveci  infection-associated mass clinically mimicking a malignancy (ie, pseudotumor) is rare and usually occurs in the lung in association with  Pneumocystis  pneumonia.  Pneumocystis jiroveci  pseudotumors of the small intestine are extremely rare and represent an unusual form of disseminated  P jiroveci  infection. We present a case of small-intestine  P jiroveci  pseudotumor as an acquired immunodeficiency syndrome-presenting illness in a patient with coinfection with cytomegalovirus, no pulmonary symptoms, and no known risk factors for human immunodeficiency virus infection. This case reinforces the potential importance of cytomegalovirus coinfection in the disseminated form of  Pneumocystis  infection and illustrates the importance of an expanded differential diagnosis when confronted with a clinically atypical mass lesion.
authors.affiliation: Department of Pathology (MC 847), UIC, College of Medicine, 840 S Wood St, Room 110 CSN, Chicago, IL 60612, USA. yizhou@uic.edu
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhou
authors.forename: Jayarama
authors.initials: J
authors.lastname: Shetty
authors.forename: Michael R
authors.initials: MR
authors.lastname: Pins
mesh_terms: D017088:AIDS-Related Opportunistic Infections / Q000175:diagnosis / Q000209:etiology*; D000163:Acquired Immunodeficiency Syndrome / Q000150:complications* / Q000175:diagnosis; D000368:Aged; D060085:Coinfection / Q000150:complications / Q000175:diagnosis; D003586:Cytomegalovirus Infections / Q000150:complications / Q000175:diagnosis; D003937:Diagnosis, Differential; D006801:Humans; D007410:Intestinal Diseases / Q000175:diagnosis / Q000209:etiology*; D007421:Intestine, Small / Q000382:microbiology / Q000473:pathology; D008297:Male; D016720:Pneumocystis Infections / Q000150:complications* / Q000175:diagnosis; D045363:Pneumocystis carinii / Q000302:isolation & purification