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Correspondence

Metastasizing Aggressive Angiomyxoma

N Engl J Med 1999; 341:1772December 2, 1999

Article

To the Editor:

Aggressive angiomyxoma is a rare myofibroblastic tumor that arises mainly in the perineum and genitalia in premenopausal women. Histologically, the tumor has a monomorphic pattern, with small, spindle-shaped mesenchymal cells dispersed in a loose, myxoid matrix and a characteristic vascular component. Cellularity is generally low, and mitoses are not seen. Despite this innocuous-looking histologic pattern, angiomyxoma has a strong tendency to be locally aggressive, with infiltrative growth and local recurrence.1 In approximately 100 documented cases, however, no evidence of distant metastasis has been reported. We describe a case of aggressive angiomyxoma of the pelvis that metastasized to the mediastinum and lungs.

A 63-year-old woman presented with a seven-week history of nonspecific abdominal symptoms. Abdominal computed tomography (CT) showed four pelvic tumors, up to 9.5 by 7 cm, with many enlarged lymph nodes adjacent to the iliac vessels and aorta. Thoracic CT showed a mass, 6 by 10 cm, in the left upper lobe, multiple round lesions up to 15 mm in diameter in both lungs, and many enlarged mediastinal lymph nodes. Histologic examination of a specimen from a CT-guided, core needle punch biopsy of a pelvic tumor revealed a mesenchymal tumor.

During exploratory laparotomy, a myxoid tumor was found in the pelvis, with teardrop-shaped metastases in the greater omentum, the mesentery, and the peritoneum. All visible tumor was removed, and a radical resection performed.

Histologic examination of the specimen showed a myxoid tumor with sparse infiltrates of polymorphic cells clustering around blood vessels (Figure 1AFigure 1Specimens from the Primary Tumor in the Pelvic Soft Tissue (Panel A) and the Metastatic Pulmonary Lesion (Panel B) (Hematoxylin and Eosin, ×120).). Immunohistochemical studies showed strong staining for CD34, estrogen receptors, and progesterone receptors. Staining for actin, desmin, and vimentin was intermediate, and staining for S-100 protein was negative. The histologic diagnosis was aggressive angiomyxoma. A core needle–biopsy specimen of one of the intrathoracic lesions showed the same histologic pattern (Figure 1B), confirming the metastatic spread of the primary tumor.

Aggressive angiomyxoma was first described in 1983.2 Despite morphologic and histologic indicators of malignancy, to our knowledge there have been no reports of the metastatic spread of such tumors. In the present case, the tumor had not only spread diffusely throughout the abdominal cavity but had also caused multiple metastases in the mediastinum and both lungs. Other diagnoses, such as myxoid liposarcoma and angiomyofibroblastoma,3 could be clearly ruled out on the basis of histomorphologic and immunohistochemical criteria.4 These findings suggest that aggressive angiomyxoma can no longer be considered a purely localized disease.

Ramin Michael Siassi, M.D.
Thomas Papadopoulos, M.D., Ph.D.
Klaus E. Matzel, M.D., Ph.D.
University of Erlangen, 91054 Erlangen, Germany

4 References
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