Mammary-type myofibroblastoma of the soft tissue is a benign mesenchymal tumor, and it is a recently established clinical entity. We report a case of myofibroblastoma of the chest wall with a prominent epithelioid feature, that occurred in a 12-year old female. Although the lesion occurred in the breast area, there was no breast parenchyma in or around the mass, which favored soft tissue of the chest wall origin. The tumor was immunohistochemically identical to the mammary-type myofibroblastoma with diffuse and strong positivity against CD34 and desmin. The myoepithelial differentiation of the tumor was further supported by the electron microscopic analysis. This case indicates that mammary-type myofibroblastoma can occur in a young girl. The mammary-type myofibroblastoma should be considered a differential diagnosis, among epithelioid soft tissue neoplasms in the chest wall when the proper immunohistochemical work-up is done.
Breast ; Child ; Desmin ; Diagnosis, Differential ; Female ; Humans ; Neoplasms, Muscle Tissue* ; Soft Tissue Neoplasms ; Thoracic Wall* ; Thorax*

OBJECTIVE: To determine the histopathologic features associated with ultrasonographic echogenicity of thyroid nodules. MATERIALS AND METHODS: This study included 95 nodules of 95 patients (76 women, 19 men; mean age 47.5 ± 12.9 years) with homogeneous echogenicity in which core needle biopsy was performed during a one year period. The nodule echogenicity was categorized into 4 grades (hyperechogenicity, isoechogenicity, mild hypoechogenicity, and marked hypoechogenicity). The biopsy specimens were evaluated by a pathologist regarding the histopathologic features of fibrosis, lymphoid infiltration, microfollicular pattern, uniform follicular pattern, and hypercellularity in nodules. We evaluated the association of each histopathologic feature among 3 categories of nodule echogenicity by multinomial regression analysis. RESULTS: The nodule echogenicity was isoechoic in 28 (29.5%), mildly hypoechoic in 37 (38.9%), and markedly hypoechoic in 30 (31.6%), and there was no hyperechoic nodule. There was a trend of increasing frequency of fibrosis (> 30%) as nodule echogenicity decreased (isoechogenicity, 10.7%; mild hypoechogenicity, 32.4%; and marked hypoechogenicity, 80%; p < 0.001). The microfollicular pattern, uniform follicular pattern, and hypercellularity were frequently found in mildly hypoechoic nodules than in isoechoic nodules (p ≤ 0.018). The fibrosis (> 30%) and hypercellularity were independently associated with mild or marked hypoechogenicity as compared to isoechogenicity (fibrosis; p ≤ 0.004 and hypercellularity; p ≤ 0.036), and only fibrosis (> 30%) was independently associated with marked hypoechogenicity as compared to mild hypoechogenicity (p = 0.004). CONCLUSION: The fibrosis (> 30%) and high cellularity are independently associated with mild or marked hypoechogenicity of nodules. The knowledge of the relationship of echogenicity and histopathology of thyroid nodules could improve management of patients with thyroid nodules.
Biopsy ; Biopsy, Large-Core Needle* ; Clothing ; Female ; Fibrosis ; Humans ; Male ; Thyroid Gland* ; Thyroid Neoplasms ; Thyroid Nodule* ; Ultrasonography