Fibroadenomas with stromal cellularity. A clinicopathologic study of 21 patients.

: Data on clinical and pathologic features of tumors from 21 patients who had breast tumors compatible with juvenile (cellular) fibroadenomas (JCF) were reviewed. All patients were black females ranging in age at time of presentation from 10 to 39 years, with a median age of 15 years. Follow-up (median period, six years) was obtained for 20 patients. Patients were categorized into two groups; 13 had solitary lesions and eight had multiple and successive lesions. No histologic differences were observed between JCF occurring as solitary or multiple tumors or between lesions occurring in patients younger and older than age 20 years. The JCF was shown to be a fairly distinct clinicopathologic entity that characteristically occurred in adolescents, but which was occasionally seen in young adults. It had a benign course, characterized by synchronous and metachronous multicentricity, rather than local recurrence.