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INTRODUCTION Desmoplastic fibroblastoma (collagenous fibroma) is a recently described tumor thought to arise predominantly from subcutaneous tissue or skeletal muscle. The natural evolution of this tumor on magnetic resonance imaging has never been described, to the best of our knowledge. We herein report a case of desmoplastic fibroblastoma arising in the… (More)
From a clinicopathological conference on nine elderly patients with Epstein-Barr virus (EBV)-associated T/natural killer (NK)-cell lymphoma, we have addressed the patients' backgrounds, clinical manifestations, histopathological findings, cytogenesis, complications and prognoses. Among these elderly patients (>65 years old), seven patients had extranodal… (More)
We present herein the case of an 80-year-old woman with a keratotic plaque measuring 1.4x1.3 cm on the left popliteal fossa. The plaque was resected and diagnosed on microscopic examination as low-grade sebaceous carcinoma. Sebaceous carcinoma on the leg seems extremely rare.
Enchondroma is the most common primary benign bone tumor of the hand. Chondrosarcomas in this location, however, are extremely rare. It often is difficult to make a histological distinction between benign cartilaginous tumors and low-grade chondrosarcomas, because enchondromas at this site often show histological features suggestive of malignancy. However,… (More)
We herein describe a case of melanoma that metastasized to the esophagus from a primary melanoma of the abdominal skin in a 40-year-old female. Esophagography and endoscopy demonstrated a 30-mm protruding mass in the proximal third of the esophagus, and this was diagnosed as malignant melanoma by mucosal biopsy. The patient also had a pigmented lesion on… (More)
Malignant bone tumors with epithelial differentiation are extremely rare. Only one case of primary malignant bone tumor with distinct squamous cell carcinoma and chondrosarcoma has ever been reported. Reported herein is a case of primary malignant bone tumor with distinct squamous cell carcinoma and chondrosarcoma, so-called carcinosarcoma of bone, arising… (More)
Nevus sebaceous is known by its association with one or more secondary tumors, but more than three multiple tumors arising from a nevus sebaceous is extremely rare. A 67-year-old female presented with a light brown plaque on the back of her head that contained a dome-shaped black node and an erosive lesion. Histopathological examination showed atypical… (More)