RT Journal
A1 Palmer HE, North P, Nicholas RW, Allison JW, Parham DM
T1 PAthologic case of the month
JF Archives of Pediatrics & Adolescent Medicine
JO Archives of Pediatrics & Adolescent Medicine
YR 1999
FD October 1
VO 153
IS 10
SP 1107
OP 1108
DO 10.1001/archpedi.153.10.1107
UL http://dx.doi.org/10.1001/archpedi.153.10.1107
AB 
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.