Sonographic diagnosis of subungual intraosseous epidermoid cyst.

Intraosseous epidermoid cyst is an uncommon subungual mass. We report the sonographic findings in a case of intraosseous epidermoid cyst, which showed the characteristic whorled pattern of layers, previously described in other locations and unequivocally clinched the diagnosis in favor of this benign etiology and guided the management to phalangeal-sparing surgery.