Pseudomalignant osseous tumor of soft tissue: a case report and review of the literature.

Pseudomalignant osseous tumor of soft tissues is a rare tumor of the hand. Histopathologic differentiation of this benign lesion from malignant lesions is difficult because mitotic figures are common in typical cases, but bizarre pleomorphic and hyperchromatic nuclei never occur. Wide excision is adequate in most cases, but ray resection is indicated when this benign lesion recurs after wide excision, invades the vital structures, or causes severe functional impairment. Review of the literature revealed 15 cases of this lesion in the digits of the hand, including our case. Of these 15 cases, misdiagnosis of malignancy in three cases and loss of function in an additional four cases led to ray resection.