Pulmonary inflammatory pseudotumor: radiologic features

Radiology. 1998 Feb;206(2):511-8. doi: 10.1148/radiology.206.2.9457206.


Purpose: To define the radiologic features of pulmonary inflammatory pseudotumor.

Materials and methods: Between 1966 and 1994, 61 cases of pulmonary inflammatory pseudotumor involved 36 male and 25 female patients (age range, 17 months to 61 years; mean, 28 years). Clinical presentation, pathologic features, and radiologic findings were noted.

Results: At radiography, 52 patients had solitary peripheral nodules or masses, and extraparenchymal involvement--including hilar, mediastinal, and airway invasion--was found in 11. At computed tomography, 12 lesions were of heterogeneous attenuation and five, homogeneous. At T1-weighted magnetic resonance imaging, five lesions had intermediate signal intensity; of two lesions studied with T2-weighted imaging, two had high signal intensity; and the one lesion studied with gadolinium-enhanced imaging had diffuse enhancement.

Conclusion: Pulmonary inflammatory pseudotumor was typically a solitary, peripheral, sharply circumscribed mass with an anatomic bias for the lower lobes. Local invasion and primary involvement of the mediastinum and hilar structures were unusual manifestations.

MeSH terms

  • Adult
  • Female
  • Humans
  • Lung / diagnostic imaging
  • Lung / pathology*
  • Magnetic Resonance Imaging*
  • Male
  • Plasma Cell Granuloma, Pulmonary / diagnostic imaging*
  • Plasma Cell Granuloma, Pulmonary / pathology
  • Retrospective Studies
  • Tomography, X-Ray Computed*