Organized hematoma in the paranasal sinus and nasal cavity--imaging diagnosis and pathological findings.

OBJECTIVES

The "organized hematoma" is a non-neoplastic, hemorrhagic lesion, which can develop in the paranasal sinus and nasal cavity. This is the first report on the relationship between the imaging and pathological findings.

METHODS

We diagnosed organized hematoma, based on three criteria: no existence of neoplastic cells; consistency of hematoma and fibrosis; and development from the paranasal sinus and nasal cavity. We retrospectively investigated six cases from the patients' medical records.

RESULTS

On the imaging findings, the central part of the lesion was enhanced more strongly than the lesion periphery. All of the pathological findings were hematoma at the center, and fibrosis at the periphery. In three of the cases, dilated vessels were found but not in the other three.

CONCLUSION

We found that the biphasic appearance of the imaging findings correlated with that of the pathological findings. There are two pathological types--the dilated vessel type and the non-dilated vessel type.