BACKGROUND Pleomorphic xanthoastrocytoma is rare, accounting for <1 % of all central nervous system (CNS) neoplasms. Angiomatous pleomorphic xanthoastrocytoma is an extremely rare variant of pleomorphic xanthoastrocytoma, with only six cases reported thus far. CASE PRESENTATION A 24-year-old Chinese female patient who presented with seizure and loss of consciousness for 15 min underwent compu...

Pleomorphic adenomas originating from the minor salivary glands are rare in the nasal cavity. Total surgical excision is the preferred treatment for pleomorphic adenomas. Lateral rhinotomy, midfacial degloving, transpalatal surgery and endoscopic surgery are among the surgical approaches. Endoscopic tumor removal produces less morbidity, reduces blood loss during surgery, decreases hospital sta...

BACKGROUND Histopathologic features of the capsule may have an impact on the recurrence rate of pleomorphic adenomas. METHODS Retrospective (n = 154) and prospective (n = 64) histologic analysis of the capsular characteristics such as incompleteness, tumor penetration, pseudopodia, and satellite tumors of 218 pleomorphic adenomas. RESULTS In 160 of the 218 (73%) pleomorphic adenomas, 1 or m...

We report two cases of pleomorphic astrocytoma, a rare primary brain tumor with an unusually good prognosis. These lesions typically are peripherally located, partially cystic, temporal lobe masses. Dural attachment is frequent, calcifications are not. Angiography usually shows a hypovascular mass, although blood supply from the external carotid artery may be seen.

Cryo-electron tomography (cryo-ET) is currently the only method available through which pleomorphic biological specimens are imaged to produce three-dimensional (3D) structures at ~2 to 10 nm resolution [1]. There remain challenges associated with imaging intact bacteria and pleomorphic viruses by cryo-ET. In particular, investigators cope with the low contrast of cryo-preserved, unstained spec...

Ovaries ofPalaeococcus fuscipennis (Burmeister) are accompanied by large organs termed bacteriomes which are composed of large cells termed bacteriocytes. Each bacteriocyte is surrounded with small epithelial cells. The bacteriocyte cytoplasm is tightly packed with pleomorphic bacteria, whereas in epithelial cells small coccoid microorganisms are present. The number of coccoid bacteria is signi...

Myoepithelial carcinoma, arising in a recurrent or in a pre-existing pleomorphic adenoma of the parotid gland is an extremely rare cancer. We herein report the case of myoepithelial carcinoma occurring in a recurrent pleomorphic adenoma, which showed a high metastatic potential. A 53-year-old male, who had undergone a superficial parotidectomy of the pleomorphic adenoma 2 years previously, pres...

We report a very unusual presentation of simultaneous pleomorphic adenomas of 2 different locations, hard palate and parapharyngeal space. Patient age of presentation is rare because these tumors are seen in younger patients. We treated a 70-year-old woman with these 2 tumors, resecting both lesions with intraoral and cervical approaches. Pleomorphic adenomas are frequent lesions, but in the li...

INTRODUCTION Pleomorphic adenomas are tumors mostly originating from salivary glands. These lesions in the larynx are very rare. CASE REPORT We report a rare case of pleomorphic adenoma that originated from the mucosal lining, just above the glottic area at the level of the laryngeal ventricle in a 55-year-old female patient. The tumor could not be palpated easily but was observed in the CT s...

Undifferentiated pleomorphic sarcoma is a histologic diagnosis based on cell morphology. These tumors are found throughout the body. They are rarely found in the central nervous system and almost never occur as a primary intraventricular tumor. We present the unusual case of a 68-year-old woman with an intraventricular undifferentiated pleomorphic sarcoma. We go on to discuss the clinical prese...