When Shionogi carcinoma 115 (SC115, undifferentiated medullary carcinoma showing compact cell pattern and containing androgen receptor) was transplanted into male and female DS mice, it grew only in males. In contrast to this strict androgen dependency in DS hosts, tumors composed of spindle-shaped cells appeared in more than 80% of cases when SC115 tumor was inoculated into female or castrated...

Aims: Strong expression of CD 34 has been described in many tumors. It has been proposed that these lesions arise from long-lived mesenchymal cells. We tested the hypothesis that spindle cell lesions of the breast arise from similar mesenchymal cells in mammary stroma, and to determine the potential diagnostic value of CD 34 immunostaining in these lesions. Methods and results: Sections of fibr...

BACKGROUND AND AIM: Solitary fibrous tumor (SFT) is a quite uncommon tumor that commonly occurs in the pleura but occasionally involves an oral cavity. We are reporting this rare case in the oral cavity. The diagnosis depends on microscopic and immunohistochemical features. Patients with these tumors can be carefully treated with local excision, but tumors with...

Abstract Background Schwannomas of the nose and paranasal are extremely rare. Few schwannomas arising from within lateral wall have been reported to date. Case presentation A 32-year-old male presented us with complaints left-sided nasal obstruction a mass in his cavity. The evaluation revealed benign spindle cell lesion which was excised. final histopathology report schwannoma. Discussion tumo...

Spindle cell melanoma, which is a rare form of melanoma, is clinically and histopathologically difficult to diagnose from a variety of nonmelanocytic spindle cell tumors. We describe a 42-year-old Japanese woman with amelanotic melanoma that comprised spindle cells with positive c-kit and S100A6 staining. The use of c-kit and S100A6 might be useful for improving the diagnosis.

Primary cardiac sarcomas are rare and histologically diverse, with single tumors able to demonstrate histological heterogeneity. Consequently, they often misdiagnosed as other common tumors, such myxoma or metastatic malignancies. Incorrect diagnoses can result in incomplete surgeries, inadequate treatment regimens, early recurrence. In our experience, based on the diverse cytological character...

Laryngeal spindle cell (sarcomatoid) carcinomas are uncommon tumors, frequently misdiagnosed as reactive lesions or mesenchymal malignancies. The records of 187 patients with tumors diagnosed as laryngeal spindle cell (sarcomatoid) carcinoma were retrieved from the files of the Otorhinolaryngic Tumor Registry of the Armed Forces Institute of Pathology. There were 174 men and 13 women, 35–92 yea...

When Shionogi carcinoma 115 (SC115, undifferentiated medullary carcinoma showing a compact cell pattern and con taining androgen receptor) was transplanted into male and female DS mice, it grew only in males. In contrast to this strict androgen dependency in DS hosts, tumors composed of spin dle-shaped cells appeared in more than 80% of cases when SC115 tumor was inoculated into female or castr...

calcifying fibrous tumor (cft) is a rare mesenchymal tumor, affecting children and young adults with a predilection for the soft tissue and the abdominal cavity. cft of the tubular gastrointestinal tract is very rare with less than 20 cases of gastric cfts reported in english literature. this benign hypocellular fibrosclerotic calcifying lesion can resemble other spindle cell tumors particularl...

Calcifying fibrous tumor (CFT) is a rare mesenchymal tumor, affecting children and young adults with a predilection for the soft tissue and the abdominal cavity. CFT of the tubular gastrointestinal tract is very rare with less than 20 cases of gastric CFTs reported in English literature. This benign hypocellular fibrosclerotic calcifying lesion can resemble other spindle cell tumors particularl...