A Case of Spontaneous Regression of Recurrent Desmoid Tumor
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Introduction :
The fibromatoses are a group of fibroblastic proliferations distinguished by their tendency for local aggressiveness. They are divided into two major clinicopathologic groups, namely superficial and deep. The deep fibromatoses include the so-called desmoid tumors. These are rare histologically benign tumors. Despite their benign appearance, they often exhibit repeat recurrences clinically. We report the case of a woman found to have a recurrent desmoid tumor located in the internal obturator muscle that disappeared spontaneously.

Case Report :
The study was approved by the ethics committee of our hospital. The patient gave her informed consent prior to her inclusion in the study. A 21-year-old woman with no history of illness was referred to our hospital because of left lower limb weakness during menstruation. The following day the weakness had disappeared but the menstrual colic remained; consequently, the patient was referred to a gynecologist who detected an intrapelvic tumor during internal examination. The lesion was a palpable hard mass the size of a hen’s egg located in the right vaginal wall. The patient’s laboratory evaluation included tumor markers, which showed unremarkable scores. On magnetic resonance imaging, there was an enhanced mass attached to the urinary bladder and arising from the internal obturator muscle. The tumor showed a moderately low signal intensity comparable to that of the skeletal muscles on T1-weighted images, a moderately high signal intensity on T2-weighted images, and high enhancement with a partially mottled pattern after intravenous administration of gadolinium contrast agent. Histological diagnosis of the tumors by means of transvaginal biopsy was desmoid-type fibromatosis....