PMC4345263_01
Clinical aspect of the tumorous mass adjacent to the ankle joint.
CRIOR2015-320139.001.jpg
PMC4345263_01_CRIOR2015-320139.001.jpg
fig1
A 17-year-old male patient was referred to us because of a growing mass adjacent to the left posteromedial ankle (Figure 1).
Plain radiography, anteroposterior and mediolateral view of the ankle joint.
CRIOR2015-320139.002.jpg
PMC4345263_01_CRIOR2015-320139.002.jpg
fig2
Plain radiographs in anteroposterior and mediolateral projection of the ankle showed a polycyclic slightly condensed bone structure located dorsal to the tibiotalar joint (Figure 2).
Preoperative CT images, axial and sagittal planes of the ankle joint.
CRIOR2015-320139.003.jpg
PMC4345263_01_CRIOR2015-320139.003.jpg
fig3
Otherwise the ankle joint was intact (Figure 3).
(a) Intraoperative aspect, neurovascular bundle (posterior tibial artery/veins, tibial nerve) and retinaculum of flexor muscles. (b) Intraoperative aspect, preparation and isolation of neurovascular bundle. (c) Intraoperative aspect, capsulotomy over the osteochondral lesion. (d) Intraoperative aspect, excision of the SOC tumor masses.
CRIOR2015-320139.004.jpg
PMC4345263_01_CRIOR2015-320139.004.jpg
fig4
The patient underwent complete excision through a posteromedial arthrotomy of the tibiotalar joint (Figures 4(a)-4(d)).
(a) Macroscopical aspect of the 2 masses from the ankle joint. (b) Corresponding microscopical aspect (Van Gieson's stain, magnification 2.5x).
CRIOR2015-320139.005.jpg
PMC4345263_01_CRIOR2015-320139.005.jpg
fig5
Histological findings showed that the larger fragment was made of normal cancellous bone without increased osteoblastic or osteoclastic activity; there were normal adipocytes in the bone marrow; thin cartilaginous coverage was of normal appearance (Figure 5(b)).
Plain radiography, anteroposterior and mediolateral view of the ankle joint at follow-up.
CRIOR2015-320139.006.jpg
PMC4345263_01_CRIOR2015-320139.006.jpg
fig6
Plain radiography did not show any relapse of the lesion (Figure 6).
PMC4345263_02
Plain radiography, anteroposterior and mediolateral view of the knee joint.
CRIOR2015-320139.007.jpg
PMC4345263_02_CRIOR2015-320139.007.jpg
fig7
Plain radiographs showed a partially calcified intra-articular lesion in the Hoffa fat pad (Figure 7).
Preoperative MR images, sagittal plane T1- and T2-weighted images, of the knee joint.
CRIOR2015-320139.008.jpg
PMC4345263_02_CRIOR2015-320139.008.jpg
fig8
T2-weighted MR images, the masses were heterogeneously of high signal intensity (Figure 8).
Macroscopic aspect of the tumorous mass in Hoffa's fat pad.
CRIOR2015-320139.009.jpg
PMC4345263_02_CRIOR2015-320139.009.jpg
fig9
The patient underwent an open arthrotomy with resection of the mass. The specimen with a maximum diameter of 5 cm was examined pathologically (Figure 9).