Inflammatory pseudotumor of the trachea in a ten-month-old infant.

Inflammatory pseudotumors occur through a non-neoplastic process that involves abnormal proliferation of spindle cells (myoblasts and fibroblasts) with an inflammatory cell infiltrate. Clinically, radiographically, and grossly these lesions mimic malignant neoplasms but are readily distinguished histologically. We report an infant who presented with an inflammatory pseudotumor of his trachea that caused severe stridor.