Imaging features of chronic expanding hematoma in the soft tissues of the hand simulating an aggressive lesion: case report.

A chronic expanding hematoma can persist and increase in volume for more than 1 month after the first hemorrhage. It is rare, uncommon in the hand, little known among physicians, and an imitator of malignancy. Our purpose was to report a case of this condition in the soft tissues of an 8-year-old girl's hand that simulated an aggressive lesion, and to conduct a review on this subject.

Chronic diploic hematoma mimicking malignancy on imaging.

We present a case of an expansile diploic lesion involving the parietal bones in a 45-year-old man. Computed tomography, magnetic resonance imaging, and digital subtraction angiography were performed. The imaging findings strongly suggested the diagnosis of a malignant neoplasm. Nonetheless, histology revealed a chronic diploic hematoma.