We describe here a multicentric spontaneous malignant schwannoma obtained from one male F344 rat, and this animal was the subject of a carcinogenicity study for which it was treated with diisodecyl phthalate. The animal of the control group not treated with diisodecyl phthalate showed dyspnea and severe lordosis. On the necropsy, two tan, firm, encapsulated masses were observed in the subcutis ...

Common Tumors of the Skin and Subcutis The following abbreviations will be used throughout the lecture: aCA: adenocarcinoma; BCT: basal cell tumor; CGA: ceruminous gland adenoma/adenocarcinoma; FSA: fibrosarcoma; HCT; histiocytoma; HPA: hemangiopericytoma; LI: lipoma; MCT: mast cell tumor; MH: malignant histiocytosis; MM: malignant melanoma; PCT: plasma cell tumor; NST: nerve sheath tumor (neur...

Bladder schwannomas are exceedingly rare, benign or malignant, nerve sheath tumors that are most often discovered in patients with a known diagnosis of Neurofibromatosis type 1 (NF1). A few sporadic case reports of bladder schwannoma have been published in urologic, obstetric/gynecologic, and pathologic journals. However, this is the first case report in the radiologic literature where computed...

Vestibular schwannoma (VS) usually present the widening of internal auditory canal (IAC), and these bony changes are typically limited to IAC, not extend to temporal bone. Temporal bone invasion by VS is extremely rare. We report 51-year-old man who revealed temporal bone destruction beyond IAC by unilateral VS. The bony destruction extended anteriorly to the carotid canal and inferiorly to the...

INTRODUCTION Schwannoma is a rare tumor among pancreatic neoplasms. Schwannomas vary in size, and most of them are cystic, mimicking pancreatic cystic lesions. Generally, a definitive diagnosis is made at the time of histological analysis. The mainstay treatment is surgical resection. CASE PRESENTATION We report an unusual presentation of pancreatic schwannoma with abdominal pain and several ...

Laryngeal schwannomas are uncommon lesions with only few cases reported. Herein we present a further case of a schwannoma of the epiglottis, occurring in a 62-year-old with a clinical history of a cutaneous malignant melanoma and laryngeal glottic keratosis. The schwannoma was incidentally discovered as a small polypoid lesion located on the laryngeal surface of the epiglottis and was removed e...

Primary neural tumors of thyroid are very rare and are mainly represented by schwannomas and malignant peripheral nerve sheath tumors. This report presents a rare case of schwannoma involving the isthmus of thyroid in an 11-year adolescent male. The patient presented with soft neck mass which moved with deglutition. The histological examination indicated Antoni A type schwannoma. The clinical, ...

BACKGROUND Schwannomas are uncommon tumors of the external auditory canal. In the English literature, very few cases of schwannomas originating in the external auditory canal were reported and none of them showed chondroid metaplasia. We report the first case of schwannoma with chondroid metaplasia in this location. CASE PRESENTATION In this report, we described a 22-year-old white man who pr...

A 68-year-old female presented with inflammatory lumbalgia and cruralgia. Physical examination revealed a lumbar stiffness without neurological deficit. Secondarily, paraplegia and urinary retention appeared. Magnetic resonance imaging showed a vertebral compaction of L3 vertebra with medullar compression. Emergent surgery revealed an epidural tumor involving largely the L3 vertebral body. Hist...