Journal List > J Korean Bone Joint Tumor Soc > v.20(2) > 1052048

Song, Cho, Lee, Kong, Koh, Jeon, and Lee: Diagnosis, Treatment and Prognosis of Low Grade Central Osteosarcoma

Abstract

Purpose

We analyzed the diagnosis and the treatment outcomes of patients with central low grade osteosarcoma.

Materials and Methods

We retrospectively reviewed 16 patients with central low grade osteosarcoma were treated at out institution between 1994 and 2011.

Results

There were 4 men and 12 women with mean age of 26 years. Eleven patients were correctly diagnosed but 5 patients were misdiagnosed as osteoid osteoma, non ossifying fibroma, aneurysmal bone cyst, desmoplastic fibroma. 15 patients finally received wide margin en bloc excision and one of them treated under neoadjuvant chemotherapy. Final survival status was continuous disease free in 14 and 1 patient died of renal cell cancer. Remaining 1 with multifocal lesions is alive with disease for 7 years only treated radiation therapy on residual tumors. Nine (56%) of 16 tumors showed extraosseous extension of tumor (56%) and 1 of them showed extra-compartmental tumors.

Conclusion

The diagnosis of central low grade osteosarcoma is challenging, however, considering of the clinical suspicion, the typical findings of radiologic and pathologic features, proper diagnosis is needed. This tumor should be treated with wide excision, even after an intralesional excision, to avoid local recurrence or transformation to higher histologic grade.

References

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Figure 1.
Plain radiograph of a 21-year-old man showing expansile mixed osteolytic and sclerotic lesion in the distal meta-diaphysis of femur. Radiologic differential diagnosis included osteosarcoma, fibrosarcoma, adamantinoma, and giant osteoblastoma.
jkbjts-20-47f1.tif
Figure 3.
Plain radiograph of a 20-year-old man showing predominantly lytic lesion in the distal femur. Radiologic differential diagnosis included osteosarcoma, fibrosarcoma, chondrosarcoma, and giant cell tumor with aneurismal bone cystic change.
jkbjts-20-47f2.tif
Figure 2.
(A) Plain radiograph of a 19-year-old girl showing mixed osteolytic and sclerotic lesion in the proximal humerus. (B) The typical histologic appearance of low-grade osteosarcoma, permeation of osseous trabeculae by spindle cell stroma (hematoxylin-eosin, ×100).
jkbjts-20-47f3.tif
Figure 4.
(A) Plain radiograph of a 54-year-old woman showing sclerotic lesion in the distal femur. (B) Mature bone trabeculae is admixed with permeating spindle cell stroma (×100).
jkbjts-20-47f4.tif
Table 1.
Patient Characteristics and Radiologic Feature
Case number Age/ Gender Previous diagnosis Previous treatment Location Radiologic Pattern Tumor size (cm)/ Volume (cc) E xtra-osseous extension
1 7/F Proximal femur Lytic, coarse trabeculation 3×2.1×1.6/5.3
2 11/F Proximal humerus Densely sclerotic 3.2×1.7×1.6/4.6
3 19/F Proximal humerus Mixed lytic and sclerotic 6.4×4.2×4/56.3 +
4 19/F Distal radius Densely sclerotic 7.5×2.9×2.5/28.5 +
5 20/F Pelvis, pubis Lytic, coarse trabeculation 8×5×3/62.8 +
6 20/M Distal femur Predominantly lytic 8.6×5.6×3.9/98.3 +
7 21/M Distal femur Mixed lytic and sclerotic 9.5×6.8×5.9/199.6 +
8 24/F Proximal humerus Densely sclerotic 8.7×6×4.9/140 +
9 32/M Proximal tibia Mixed lytic and sclerotic 7×6×5/110
10 36/M Pelvis, ilium Densely sclerotic 4.6×4.5×2.4/26
11 38/F Scapular Densely sclerotic 7.8×6.5×4.5/119.5 +
12 39/F Distal fibular Mixed lytic and sclerotic 17×3.5×2.5/77.9 +
13 54/F Distal femur Densely sclerotic 6.5×4×2.8/38.1
14 16/F Low-grade sarcoma Radiofrequency Ablation Distal femur Lytic, coarse trabeculation 10.3×3.6×3.2/62.1
15 20/F NOF Curettage Calcaneus Mixed lytic and sclerotic 6.3×4.5×3.4/50.5 +
16 38/F ABC on biopsy* Curettage Proximal tibia Predominantly lytic 7×6×5/110

ABC, aneurismal bone cyst; *Hemangioendothelioma on curettage specimen; NOF, nonossifying fibroma.

Table 2.
Surgical Procedure, Immune-Histochemical Analysis, and Clinical Course
Case number Chemotherapy Definitive treatment Surgical margin Local recurrence Metastasis Followup (months) Final statu
1 Intercalary resection, overlapping allograft Wide 56 CDF
2 Intercalary resection, overlapping allograft Wide 57 CDF
3 Allograft prosthesis composite Wide 35 CDF
4 Excision, fibula graft Wide 171 CDF
5 Internal pelvectomy Marginal 141 CDF
6 Tumor prosthesis Wide 74 CDF
7 + Tumor prosthesis Wide 44 CDF
8 Tumor prosthesis Wide 45 CDF
9 Tumor prosthesis Wide 107 CDF
10 Internal pelvectomy Marginal 21 DOC
11 Scapulectomy Wide 122 CDF
12 Resection, overlapping allograft Wide 46 CDF
13 Tumor prosthesis Wide 36 CDF
14 Radiotherapy + 142 AWD
15 Cement spacer Marginal 46 CDF
16 Pasteurized bone-prosthesis composite Wide 162 CDF

CDF, continous disease free; AWD, alive with disease; DOC, died of other cause (renal cell carcinoma).

Table 3.
Comparison with Previous Studies
Author Number of patients Definitive treatment Intralesional operation* (%) Chemotherpy LR Metastasis Final status
Current study 16 13/3 3/16 (19%) 1/16 (6%) 0% 0% NED (15), DOC (1), AWD (1)
Choong et al8) 20 12/8 12/20 (60%) 14% 20% NED (16), DOD (4)
Malhas et al12) 18 11/7 10/18 (56%) 7/18 (39%) 11% 11% NED (16), AWD (1), DOD (1)
Yoshida et al14) 9 3/6 3/9 (33%) 5/9 (56%) 14% 43% NED (4), AWD (2), DOD (1)
Dujardin et al18) 6 NA NA NA NA NA NA
Hayashi et al13) 5 NA 2/5 (40%) NA 0% 0% NED (5)

* Either at primary or referral center

LR, local recurrence after definitive treatment; NED, no evidence of disease; DOC, died of other cause; AWD alive with disease; DOD, died of disease; NA, data not available.

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