Abstract
A recently proposed addition to fibrous tumors in soft tissue was first described as desmoplastic fibroblastoma and later renamed collagenous fibroma. This tumor is clinically and morphologically distinct and benign. However, only a few series have been reported, and the clinicopathologic features are not widely recognized. We present two cases of collagenous fibroma of the arm. Both patients presented with an enlarging, well-circumscribed and mobile soft tissue mass. Magnetic resonance imaging showed areas of low signal intensity on both T1- and T2-weighted sequences. Needle aspiration cytology revealed nondiagnostic samples because of the low cellularity of the tumors. Each of the resected tumors was composed of low-cellular spindle- to stellate-shaped cells in a fibrous matrix with clear margination. After the marginal excisions, no recurrences were observed. Clinicians should be aware of this entity to prevent overtreatment, because imaging findings and cytologic features are similar to those of desmoid tumor.
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Received: 15 December 1999 Revision requested: 12 January 2000 Revision received: 31 March 2000 Accepted: 17 March 2000
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Ogose, A., Hotta, T., Emura, I. et al. Collagenous fibroma of the arm: a report of two cases. Skeletal Radiol 29, 417–420 (2000). https://doi.org/10.1007/s002560000223
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DOI: https://doi.org/10.1007/s002560000223