Subcutaneous masses of the scalp and forehead: diagnosis by fine-needle aspiration.

We report our cytologic findings and clinical correlations in benign (N = 2) and malignant (N = 16) subcutaneous masses of the scalp (N = 15) and forehead (N = 3), studied by fine-needle aspiration (FNA). Diagnoses were divided in 3 groups: (1) Scalp plasmacytoma (as a manifestation of multiple myeloma) (6 cases) was the most frequent diagnosis. In one patient it was the presenting manifestation of the disease. (2) Miscellaneous malignancies included 8 carcinomas, 1 melanoma, and 1 malignant lymphoma. The scalp or forehead mass was the initial presentation and FNA was the initial diagnostic approach in five patients. (3) A single case each of pilar-type keratinous cyst and hematoma were the only benign masses encountered. In conclusion, a significant number of subcutaneous masses of the scalp or forehead represent metastatic or systemic malignancies, and they may be the initial manifestation of the disease. Rapid and accurate diagnosis by FNA provides guidelines for appropriate therapy, especially in those patients who present with advanced disease.