a 28-year-old man with neurofibromatosis type 1(nf1) presented with a tumor in the sciatic nerve and femoral nerve. the differential diagnosis of malignant peripheral nerve sheath tumor was based on clinical, radiological, and histological evidence. the tumor apparently originated in sciatic nerve at the posterior aspect of the left thigh. the lesion was resected totally without neural damage t...

a case of intramuscular hemangioma of the right forearm and hand muscle is presented in this study. this tumor may infiltrate the muscle and be misdiagnosed as a malignant neoplasm. the patient, a 14-year-old girl, presented to the clinic with right forearm and hand pain and swelling which began when she was 2 years old and had been gradually increasing in size. because the mass might have been...

inflammatory pseudotuomr refers to a group of benign tumor like lesions that they are composed of a mixed inflammatory infiltrates. the diagnosis of these lesions and differentiation of them from malignant process may be difficult. we report on a 35-year- old man who presented with multiple painless palpable masses in his right hemiscrotum for about 6 months. right epididymal involvement with i...

Giant cell carcinoma of the endometrium is a rare and an aggressive tumor that should be distinguished from other endometrial tumors with a prominent giant cell component, including trophoblastic tumors, certain primary sarcomas, and malignant mixed müllerian tumors. At present, cumulative data on this rare histological variant is limited and the prognostic significance of the presence and the ...

The sarcomatoid variant of hepatocellular carcinoma (HCC) is a rare histologic variant comprising malignant spindle cells and typical HCC. The proportion of the spindle cell component varies; when the tumor fully consists of malignant spindle cells, it is difficult to distinguish from various primary sarcomas. The 2010 World Health Organization classification of gastrointestinal tract tumors cl...

Neurofibromatosis type 2 is an inherited disease. The main manifestation of the disease is the development of symmetric, non-malignant brain tumors in the region of the cranial nerve VIII usually as schwannoma. We report here a 20-year-old woman with primary intracranial malignant nerve sheath tumor located in the left cerebellopontine angle. Histologically, the tumor showed malignant spindle c...

primary malignant neoplasms of the pericardium are rare and are predominantly mesotheliomas, followed by benign localized fibrous mesothelioma, malignant fibrosarcoma, angiosarcoma and benign and malignant teratomas. 1 this article concerns an atypical presentation of this malignant tumor with symptoms and signs of pericardial effusion. this unusual feature was complete encasement of the heart ...

Malignant mixed Müllerian tumor is a rare malignancy of the genital tract and extremely uncommon in extragenital sites. This report describes a case of malignant mixed Müllerian tumor arising in the lower peritoneum of a 72-year-old female patient. The patient presented with ascites, lower abdominal mass and pleural effusion. The serum level of CA125 was elevated. At operation a diffuse carcino...

neurofibromatosis type 2 is an inherited disease. the main manifestation of the disease is the development of symmetric, non-malignant brain tumors in the region of the cranial nerve viii usually as schwannoma. we report here a 20-year-old woman with primary intracranial malignant nerve sheath tumor located in the left cerebellopontine angle. histologically, the tumor showed malignant spindle c...