Tumors that are metastasizing generally considered as malignant. But there are exceptions. Giant cell tumor of bone is well known for its potential to metastasize without sarcomatous transformation. Potential of benign GCT to metastasize was first reported by Jaffe et al in 1940. Prevalence of pulmonary metastasis in benign GCT is between 1-9%. Factors favoring metastasis include recurrence of tumor, surgical manipulation of initial bone tumor, location of femur etc. Peripheral or basilar portion of pulmonary parenchyma is involved commonly. Eventhough death reported in 16-25% of cases, overall it has a favorable prognosis. Surgical resection is preferred treatment for pulmonary metastasis. In the present study 2 case studies were done. In 1st study 18 year old female, known case of GCT Lt tibia, with history of curetting and cementing presented with pain and swelling at same site and pulmonary metastasis 1 year later. Biopsy from initial as well as recurrent tumor confirmed benign GCT without any features of atypia, mitosis or necrosis. Aspirate from pulmonary lesion showed osteoclastic giant cells. No treatment given to metastatic deposits and is asymptomatic even though size of pulmonary lesions is increasing. And in second study a 22 year old female, with past history of GCT referred to our institution for evaluation of lung lesion detected in X-ray. Patient underwent metastatectomy here and histopathology was similar to that of bone lesion. There was no evidence of sarcomatous transformation both in initial and recurrent lesion. Patient is asymptomatic other wise and doing well.
Liver is affected as a late complication of high risk cases of Langerhans cell histiocytosis. Sclerosing cholangitis is a rare pattern associated with Langerhans cell histiocytosis of liver, which is even rarer in the adult population and has high mortality. The treatment is difficult and may require liver transplantation. We report a unique case of a 40-year-old female who developed sclerosing cholangitis associated with Langerhans cell histiocytosis without any evidence of involvement of other systems. Our patient required only surgery, and had been followed up for two years without recurrence. We could not find any other case of solitary liver involvement of Langerhans cell histiocytosis in literature published so far.
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