Eccrine spiradenoma is a benign tumor of sweat gland origin. Malignant eccrine spiradenoma is a rare neoplasm which almost always arises from a pre-existing spiradenoma lesion. In this article, we present a patient with malignant eccrine spiradenoma of the auricula with a prior diagnosis as benign eccrine spiradenoma. Although malignant transformation is usually associated with aggressive behav...

the primitive neuroectodermal tumor (pnet) belongs to a group of highly malignant tumors and is composed of small round cells of a neuroectodermal origin. categorized in the same tumor family as ewing sarcoma, the pnet is most likely to occur in bones and soft tissues. however, a small number of pnet cases arising in the pelvis have been reported as well. we present three cases of pelvic pnet: ...

Basosquamous carcinoma is a rare tumor with features of both basal cell and squamous cell carcinoma, linked by a transition area. It is a rare epithelial neoplasm with a tendency for local recurrence. It also has a high incidence of distant metastasis, a condition that differentiates it from the basal cell carcinoma. In this case, the slow course of the infiltrative lesion associated to patient...

Retroperitoneal E-GIST is a very rare tumor and a total of 58 cases have been reported in the literature (2). The distinction of E-GIST from gastrointestinal stromal tumors (GIST) is made by proving the origin outside the alimentary system and ruling out a concurrent neoplasm in the gastrointestinal tract. In this letter, we aimed to report a very rare form of E-GIST arising from the retroperit...

Glomangiosarcoma, or malignant glomus tumor, is a very rare neoplasm that when seen typically arises from a benign glomus tumor. Despite having histologic features of malignancy, these tumors usually do not metastasize. However, when metastasis occurs this disease is often fatal. We report a case of a malignant glomus tumor arising de novo on the nose of an 89-year-old white woman, and we revie...

Tumors of the urethra, whether primary or metastatic, are very rare. The true nature of urethral neoplasm is not always obvious clinically nor in routine histological sections. Immunostains should be performed on such lesions because of management implications. We present a case of multiple metastases to the urethra from a prostatic carcinoma, masquerading as multiple urothelial carcinomas. Pat...

Method Video-assisted thoracoscopic biopsy (due to newly diagnosed pulmonary nodules) revealed mesenchymal malignant neoplasm. Echocardiography showed a large mass located in the right atrium, arising from the anterior tricuspid valve. [Fig 1] Magnetic resonance imaging (MRI) of the heart demonstrated further anatomic details.18F PET-CT scan revealed increased tracer uptake in lung nodule and i...