ABSTRACT

Observation:

Collagenous fibroma (desmoplastic fibroblastoma) is a rare and benign soft tisue tumor, affecting mainly men in their 5th through 7th decades. These lesions are well-circumscribed, slow-growing, firm, and painless masses of 1-15 cm diameter with oval, fusiform or disc shape. The tumor consists of hypocellular proliferation of the spindle to stellate-shaped mesenchymal cells, embedded in a hyalinized collagenous stroma. Up till now, approximately 120 cases have been reported in the literature. In the English dermatologic literature, only 5 cases have been discussed before. In this report, a 65 year old male patient with superficial collagenous fibroma presenting with an unusual clinical appearance over the left breast has been described. The clinicopathological features are also discussed in comparing with other cases reported in the literature.