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Sao Paulo Medical Journal

Print version ISSN 1516-3180On-line version ISSN 1806-9460

Sao Paulo Med. J. vol.115 no.3 São Paulo May/June 1997 



Chondrosarcoma secondary to hereditary multiple exostosis treated by extended internal hemiplevectomy



Ademar Lopes; Sandra Morini; Leonardo José Vieira; Antonio Talvane de Oliveira

Pelvic Surgery, Pathology Department and Surgery Residents, Hospital A.C. Camargo, Antonio Prudente Foundation - São Paulo, Brazil

Address for correspondence




The authors report on the case of a 28-year-old patient with extensive chondrosarcoma of the left ischium and pubis involving hip joint, skin, and soft tissue of the gluteal region, secondary to hereditary multiple exostosis submitted to an extended internal Enneking type II and Ill hemipelvectomy. No prosthesis or arthrodesis was used. A few years ago, patients with extensive tumors like this one were treated with interilioabdominal amputation, resulting in a loss of quality of Iife.Two years after the limb-preserving surgery, this patient was disease free, with good functional results, including bipedal ambulation with support.

Uniterms: Chondrosarcoma. Osteochondroma. Surgery. Prosthesis. Iliac bone. Osteochondromatosis.


Os autores descrevem o caso de um paciente de 28 anos, com extenso condrossarcoma do ísquio e púbis esquerdos envolvendo articulação coxo-femural, partes moles e pele da região glútea, secundário à osteocondromatose múltipla familiar e submetido a hemipelvectomia interna tipo Enneking II e III alargada. Não se usou nenhum tipo de prótese ou artrodose.Há poucos anos, pacientes com tumores dessa extensão eram submetidos a amputação interilioabdominal com perda do membro e piora da qualidade de vida. Dois anos após a cirurgia preservadora do membro, o paciente está livre da doença, com bom resultado funcional, inclusive, com apoio bipodálico auxiliado por suporte.




Hereditary multiple exostosis (HME), described by Boyer in 1814,1 is a dominant autosomal inherited disorder characterized by the presence of multiple osteochondroma. Transformation of HME ranges from 10-38 percent, and in solitary osteochondroma from 1-16 percent.2 Surgery is the treatment of choice for osteochondroma as well as for chondrosarcoma. This report presents a case of locally advanced chondrosarcoma, secondary to HME. Although a candidate for an interilioabdominal amputation, the patient's limb was preserved with an internal extended hemipelvectomy, without utilization of prosthesis or arthrodesis for the reconstruction. The patient presented good oncological, esthetic and functional results two years postsurgery.



A 28-year-old white male was first seen on April 10, 1994, reporting a tumor in the left gluteal region for the prior five years. He had been submitted to a previous resection elsewhere, and had suffered a local recurrence.

Deambulation was hindered by restriction of hip joint movements. Upon physical examination, the patient exhibited an extensive, hard tumoral mass with a fluted surface measuring 30x28 cm, involving the gluteal groove and extending to the perineum with compression of the penile root (Fig. 1). Upon rectal examination, the tumor filled out the ischiorectal cavity, with compression of the left lateral wall of the rectum. The lesion involved bone and was attached to the skin near the gluteal groove at the most prominent part of the tumor, and at the level of the previous surgical scar.



A CT scan showed a large tumor with interior calcifications located in the left gluteal region, destroying the ischium and the pubis and extending to the acetabular region with extensive soft tissue involvement (Fig. 2). The remaining physical examination showed negative results. The remaining laboratory and clinical examinations, including hemogram, biochemical tests, chest CT, abdominal ultrasonography and ECG were normal.



A family history revealed that the patient's father, three out of four brothers, and one sister presented multiple bone exostosis, as did his two children, a girl and a boy (Fig. 3). On April 27, 1994, the patient was submitted to an extended internal Enneking3 type II and III hemipelvectomy, the radical removal of the entire tumor, including the attached skin and surrounding soft tissue. The ischial and iliopubic branches and the acetabulum with the femur's head and neck were also removed (Fig. 4). No prosthesis was used for restoration, but a metal thread was used to attach the femur to the remaining iliac bone (Fig.5). The patient had a good postoperative recovery and started deambulation with crutches 15 days after surgery, being discharged on the day 19.







The surgical specimen measured 26x24x24 cm, including skin, muscles and bone structure of the acetabular cavity and head and neck of the femur (Fig. 4). At the cut surface, the tumor presented a white color, lobulated aspect, brittle and extending from the subcutaneous tissue and to the destroyed bone. Microscopic examination disclosed a moderately differentiated chondrosarcoma (Fig. 6) involving the skin at the level of the surgical scar, adjacent muscle and bone. No neoplasia was found on the surgical margins. The patient is alive and free of disease with positive esthetic and functional results, including deambulation with support (Fig. 7).







Secondary chondrosarcoma is related to a prior bone lesion, such as either solitary or multiple osteochondroma. Bone exostosis appears predominantly in males in early childhood, and the transformation into sarcomas occurs in adulthood, between 20-40 years.

Rapid growth, pain and calcifications are signs of malignant transformation. In HME, half of the offspring of the affected patient bear the gene and present exostosis. The hereditary history (Fig. 3) of this patient's family shows the relatives with osteochondormatosis, including this case in which malignant transformation occurred. The study of the gene involved in HME, as well as its possible mutations, might be of major significance for family planning and therapeutic counseling, as already occurs with other hereditary diseases such as familial colon polyposis.

Patients with this syndrome must be carefully followed, and any exostosis presenting signs of transformations or functional disorder resected. Chondrosarcoma secondary to osteochondromatosis is a low-grade malignancy, and resection with adequate margins signals a good prognosis.4

Recently, great progress has been made in the treatment of malignant bone tumors of the pelvic girdle with limb-saving surgery procedures. Internal hemipelvectomy is little known within our .surgical community. This procedure can substitute some cases of interilioabdominal amputation without impairment of the onçological margins, and improve quality of life.

In our case, an extended internal hemipelvectomy without utilization of arthrodesis or prosthesis was performed as previously described. In this case, as well as in others we have studied,5 fibrosis formed in the stump of the amputated femur, soft tissue and/or remaining iliac bone (Fig. 7) six months after surgery. This allowed the patient nonsupported deambulation under load, and greater ease in sitting down because of the limb's flexibility around the fibrous area; this does not occur when prosthesis is used. Further, with the surgical technique used in this case, we avoided the complications due to infection frequently reported with prosthesis use.6



1. Boyer A. Traite des maladies chirurgicales, Vol.3. Paris: Ve. Migneret, 1814:594.         [ Links ]

2. Mankin HJ, Cantley KP, Lippiello L. et al: The biology of human chondrosarcoma. I. Description of the series, grading, and biochemical analyses. J Bone Joint Surg 1980;62:160-76.         [ Links ]

3. Enneking WF, Dunham WK. Resection and reconstruction for primary neoplasms envolving the innominate bone. J Bone Joint Surg 1978;60:731-46.         [ Links ]

4. Lopes A, Figueiredo MTA, Gentil FC. Condrossarcoma localmente avançado do osso ilíaco tratado por amputação interilioabdominal e reparado com retalhos miocutâneo ântero-medial da coxa: Relato de um caso. Rev Bras Ortop 1989;24:255-59.         [ Links ]

5. Lopes A, Penna V, Rossi BM, Chung WT, Tanaka MH. Hemipelvectomia total interna no tratamento de tumores malignos da região pélvica. Rev Bras Ortop 1994;29:11-22.         [ Links ]

6. Huth JF, Eckardt JJ, Pignatti G, Eilber FR. Resection of malignant bone tumors of the pelvic girgle without extremity amputation. Arch Surg 1988;123:1121-24.         [ Links ]



Address for correspondence:
Ademar Lopes MD, Ph.D.
Hospital A. C. Camargo
Departamento de Cirurgia Pélvica
Rua Prof. Antonio Prudente, 211
São Paulo/SP - Brasil - CEP 01509-010

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