Abstract
Objective
To describe novel MR imaging features, and clinical characteristics of soft tissue angiomatoid fibrous histiocytoma (AFH) at presentation, local recurrence, and metastases.
Materials and methods
We described the MRI findings of six cases of histologically proven AFH. Pathologic findings, clinical presentation, and outcome were reviewed.
Results
Lesions were primarily cystic. At initial presentation, tumors were surrounded by low signal intensity fibrous pseudocapsule. High signal intensity consistent with the lymphoplasmacytic infiltrate was seen in T2-weighted and post-contrast images as a rim over the hypointense pseudocapsule (double rim sign). High signal intensity infiltrating tumoral cords extended into adjacent tissues, through pseudocapsular defects on T2-weighted and post-contrast images. The cystic component and tumor cell nodularity were demonstrated at post-contrast images. Clinically, lesions were often thought to be benign, underwent marginal resection, developed local recurrence, and one developed second recurrence consisting of metastases. Recurrent tumors appeared as multiple masses, misinterpreted as post-surgical changes. An intramuscular recurrence demonstrated double rim and infiltrating margin.
Conclusions
A predominantly well-circumscribed, primarily cystic mass with double-rim and marginal infiltration on MRI suggests the possibility of AFH, in particular in child or young adult. Inclusion of these novel observations in AFH differential diagnosis may have a significant impact on treatment and prevention of recurrence.
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Acknowledgments
We acknowledge the assistance of Dr. Diana M. Cardona for her re-evaluation of the post-surgical histopathological material in two cases and also appreciate and acknowledge the assistance in writing, language editing, and proofreading by Dr. Miriam Feliu.
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Addendum
Addendum
During the submission of this manuscript, a series of seven pediatric cases of AFH was published (Ref. 16). The unspecific features of AFH were discussed. As in other articles, the authors describe a layer that enhances after administration of contrast “due to the presence of a pseudocapsule” (Fig. 1c). Furthermore, a partial double rim is present (deep margin) as well as possible marginal infiltrating in the upper pole, and neither was recognized.
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Martinez, S.J., Moreno, C.C., Vinson, E.N. et al. Angiomatoid fibrous histiocytoma: novel MR imaging findings. Skeletal Radiol 45, 661–670 (2016). https://doi.org/10.1007/s00256-016-2344-4
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DOI: https://doi.org/10.1007/s00256-016-2344-4