An 89-year-old man with no past medical history of interest consulted for an asymptomatic lesion that had arisen on his left heel 40 years earlier and that had become ulcerated in recent months. Examination revealed an indurated, sessile, skin-colored tumor of 3.5 × 4 cm, with a superficial, exudative brownish-yellow scab (Fig. 1A). Skin ultrasound (18 MHz linear probe) revealed a well-defined,...

A schwannoma is a benign tumor composed of schwann cells which forms on the periphery of nerves. We report a case of a schwannoma derived from a lingual nerve occurring in the floor of the mouth. The patient was a 27-year-old woman who presented with the complaint of a swelling in the floor of the mouth. It is difficult to distinguish a swelling from a sublingual gland tumor, cyst, or malignant...

BACKGROUND Malignant triton tumors are relatively rare and highly aggressive tumors in which malignant schwannoma cells coexist with rhabdomyoblasts. Their occurrence in the retroperitoneum is uncommon and has been rarely reported. CASE PRESENTATION We present the case of a patient with a retroperitoneal malignant triton tumor. A 32-year-old male was referred with epigastric pain and an abdom...

TOPIC: Disorders of the Mediastinum TYPE: Medical Student/Resident Case Reports INTRODUCTION: A schwannoma is a rare neurogenic tumor arising from cells that form nerve sheath. They make up quarter all tumors and are seen between 20 to 50 years age. typically have an asymptomatic presentation benign course, with malignant features in around 5% cases. We present case 74-year-old female incidenta...

Schwannomas rarely occur in the retroperitoneum, and are normally not aggressive. Preoperative diagnosis is difficult and the surgeon may confront blood vessels, nerves or organs damage, since the intra-operative findings are various. The diagnosis and treatment of malignant schwannomas in the retroperitoneum are even more challenging. In addition, the prognosis of malignant schwannomas is extr...

Plexiform schwannoma is a type of schwannoma that can be occured at any age and any site of the oral cavity. In the gross and histopathological features, it shows plexiform or multinodular growth pattern. This variant of schwannoma is sometimes associated with neurofibromatosis type II or schwannomatosis. Histopathologically, plexiform schwannoma is composed of schwann cells that show Anthony...

schwannoma(neurilemmoma) is a benign tumor originates from schwann cells. ancient (degenerated) schwannoma is a long-standing schwannoma with degenerative changes. head and neck region is one of the most common sites for nerve sheath tumors but intraosseous schwannoma is rare. the mandible is the most common site of occurrence for this lesion. we report a rare case of intraosseous ancient schwa...

Schwannoma is a benign neurogenic tumor arising from the sheath of a peripheral nerve. Tc-99m(V) DMSA, developed by Yokoyama et al. in 1981, has been recognized as advantageous for the scintigraphic diagnosis of various malignant tumors and their metastases. Uptake of Tc-99m(V) DMSA was seen not only in malignant tumors but also in benign lesions. Tc-99m(V) DMSA has been reported to accumulate ...

Stereotactic radiosurgery is used to treat benign tumours, but its long-term effects are not fully understood. Here we describe a vestibular schwannoma that underwent malignant transformation 6 years after gamma knife radiosurgery applied to the tumour remnant after a primary resection. Histological specimens of the original specimen did not show any atypical features. Genotyping showed a TP53 ...