A Rare Tumor of the Lower Extremity Arising from the Poplite
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Introduction
Desmoid tumors, also known as aggressive fibromatosis, are an extremely rare entity. They are slow growing and histologically benign, but tend to be locally invasive at various anatomic sites. Desmoid tumors originate most frequently from abdominal fascial or musculoaponeurotic structures, although they may appear at extra-abdominal sites. The most common extra-abdominal locations include shoulder, chest wall, back, thigh, and head/neck. Extremity desmoid tumors are extremely rare.
Desmoid tumors pose a clinically challenging problem because of their tendency to mimic vascular neoplasms. Generally, histopathological examination is necessary for definitive diagnosis, as in our case. Radical resection is necessary for successful excision since desmoid tumors tend to recur locally. However, surgery, radiotherapy, or both are regarded as the treatment(s) of choice for lesions. This case report documents an extremity desmoid tumor that had been diagnosed as a vascular tumor based on its magnetic resonance imaging (MRI) characteristics.

Case Presentation
A 48-year-old man presented with a tender swelling in his right lower extremity of 3 months' duration. Physical examination revealed a visually obvious 8 × 9?cm pulsatile mass on the lateral margin of the popliteal fossa. The distal extremity was stiff and tender to palpation. There was no previous history of trauma or surgical intervention. Lower extremity Doppler ultrasonography showed an 8 × 9 × 10-cm solid heterogeneous mass in the lateral popliteal fossa. Magnetic resonance imagining (MRI) demonstrated a large mass that closely approximated the muscular structures and surrounding connective tissue (Figure 1). The lesion was felt to represent a vascular mass.....

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3420745/
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