<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><bold>Background.</bold> Parosteal osteosarcoma is a rare low-grade bone tumour. The operation material must undergo a careful patohistological analysis, because the extent of invasion of the medullar cavity and most probably the extent of dedifferentiated areas determines the prognosis and occurrence of local recurrence and metastases.<bold>Patients and methods.</bold> In this retrospective clinical study, 7 cases of parosteal osteosarcoma of the bone have been analyzed. Six patients were with parosteal osteosarcoma and one with periosteal osteosarcoma. The study was performed at the Clinic for Orthopedic Surgery in Skopje, Macedonia, from 1995 to 2006. This tumour represents 1.5% of all 467 patients with primary bone tumours treated at the Clinic in the 12 year period. The age of 7 patients (3 female and 4 male) ranged from 8 to 39 years (median 27). The history analysis of the patients showed the misinterpreted diagnosis in 57% of the cases, with 71.4 % rate of local recurrence, 28.7% of metastases and 28.7% of mortality. The follow-up varied from 7 months to 9 years (median 37 months).<bold>Results.</bold> The clinical and histopathological findings of this study (same as those reviewed in the literature) confirmed the occurrence of two biologically different types of parosteal osteosarcoma: the predominant type is originally "benign" but has a definite malignant potential, causing metastases after the long symptom-free interval. The other type is highly malignant from the beginning.<bold>Conclusions.</bold> The compartmental, radical "en bloc" resection, followed by the regular review of the patients, is recommended for the low malignant type, however, the radical surgery, followed by chemotherapy, is recommended for the highly malignant tumours.</abstract>

Background. Parosteal osteosarcoma is a rare low-grade bone tumour. The operation material must undergo a careful patohistological analysis, because the extent of invasion of the medullar cavity and most probably the extent of dedifferentiated areas determines the prognosis and occurrence of local recurrence and metastases.Patients and methods. In this retrospective clinical study, 7 cases of parosteal osteosarcoma of the bone have been analyzed. Six patients were with parosteal osteosarcoma and one with periosteal osteosarcoma. The study was performed at the Clinic for Orthopedic Surgery in Skopje, Macedonia, from 1995 to 2006. This tumour represents 1.5% of all 467 patients with primary bone tumours treated at the Clinic in the 12 year period. The age of 7 patients (3 female and 4 male) ranged from 8 to 39 years (median 27). The history analysis of the patients showed the misinterpreted diagnosis in 57% of the cases, with 71.4 % rate of local recurrence, 28.7% of metastases and 28.7% of mortality. The follow-up varied from 7 months to 9 years (median 37 months).Results. The clinical and histopathological findings of this study (same as those reviewed in the literature) confirmed the occurrence of two biologically different types of parosteal osteosarcoma: the predominant type is originally "benign" but has a definite malignant potential, causing metastases after the long symptom-free interval. The other type is highly malignant from the beginning.Conclusions. The compartmental, radical "en bloc" resection, followed by the regular review of the patients, is recommended for the low malignant type, however, the radical surgery, followed by chemotherapy, is recommended for the highly malignant tumours.

Diagnostic and treatment problems with parosteal osteosarcoma. A clinical and a histological study of 7 cases and review of the literature

University Clinic for Orthopedic Surgery-Skopje

Institute for Radiotherapy and Oncology-Skopje

University Surgical Clinic "St. Naum Ohridski", Skopje

Radiology and Oncology

Background. Parosteal osteosarcoma is a rare low-grade bone tumour. The operation material must undergo a careful patohistological analysis, because the extent...

Diagnostic and treatment problems with parosteal osteosarcoma. A clinical and a histological study of 7 cases and review of the literature

Published Online: Dec 06, 2007

Page range: 152 - 160

DOI: https://doi.org/10.2478/v10019-007-0024-7

Keywords
osteosarcoma - diagnosis - therapy, periosteum

This content is open access.

Diagnostic and treatment problems with parosteal osteosarcoma. A clinical and a histological study of 7 cases and review of the literature

Published Online: Dec 06, 2007

Page range: 152 - 160

DOI: https://doi.org/10.2478/v10019-007-0024-7

Keywordsosteosarcoma - diagnosis - therapy, periosteum

This content is open access.

Keywords
osteosarcoma - diagnosis - therapy, periosteum