Intrathoracic splenosis is a rare diagnosis that is usually
made following an invasive procedure. Although radiographic and CT
findings are nonspecific, these findings combined with a history of
splenic injury should suggest the possibility of thisdiagnosis. We
present a patient with intrathoracic splenosis diagnosed on the basis
of a technetium Tc 99m heat-damaged RBC scan following false-negative
technetium Tc 99m sulfur colloid scan results.