Diagnostic Imaging of Primary Cutaneous Osteoma of the Forehead.

Introduction: Osteoma cutis is a rare benign cutaneous nodule characterized by ectopic bone formation in the dermis or subcutaneous tissue. While most cases of osteoma cutes are secondary to inflammation, tumors, or scars, there are rare primary cases with no apparent preceding lesion. Primary osteoma cutis can be broadly classified into two categories: those associated with metabolic abnormalities, such as pseudohypoparathyroidism and Albright's hereditary osteodystrophy, and those without such underlying conditions in a more specific sense.

Case presentation: We present a case of primary osteoma cutis specifically located on the forehead in a young woman. Histopathological findings revealed a nodule of bone tissue within the dermis, along with some contiguous cartilage tissue. The patient underwent preoperative ultrasonography, computed tomography, and magnetic resonance imaging.

Conclusion: We report this case because there have been no reports of primary osteoma cutis with complete preoperative imaging findings to the best of our knowledge.