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Special Feature
October 1999

Pathologic Case of the Month

Author Affiliations

From the Departments of Pathology (Drs Palmer, North, and Parham), Orthopedics (Dr Nicholas), and Radiology (Dr Allison), University of Arkansas for Medical Sciences and Arkansas Children's Hospital, Little Rock.



Arch Pediatr Adolesc Med. 1999;153(10):1107-1108. doi:10.1001/archpedi.153.10.1107

AN 11-YEAR-OLD African American boy presented to his local physician with a complaint of painless swelling in the right calf. The lesion subsequently increased in size, and 2 months later he was limping and complaining of pain in the leg. Magnetic resonance imaging of the knee revealed a lobulated heterogeneous soft tissue mass in the lateral head of the gastrocnemius muscle with associated edema in the surrounding musculature (Figure 1). A deep-seated, tennis ball–sized mass was subsequently resected 2 weeks later. The resection included the lateral head of the gastrocnemius muscle, underlying soleus muscle, and surrounding soft tissues. The closest margin was along the neurovascular bundle in the popliteal space. There was no attachment of tumor to the periosteum or synovium.