1/4. Pigmented spindle cell naevus of reed presenting in the conjunctiva. PURPOSE: This study aimed to present the clinical and histopathological features of a pigmented spindle cell naevus (PSCN) appearing in the conjunctiva. methods: Histopathological examination of the lesion following excision and review of the pertinent literature. RESULTS: The features were consistent with those previously recognized in the skin as the PSCN of Reed. CONCLUSION: The PSCN can appear in the conjunctiva and should not be confused with conjunctival melanoma. ( info) |
2/4. Post-traumatic spindle cell nodule misdiagnosed as a herniation of the buccal fat pad. We studied a quasi-neoplastic lesion that developed in the oral mucosa secondarily to trauma. The female patient, 2 years of age, presented with a rapidly growing nodule and the lesion was diagnosed as a herniation of the buccal fat pad. Following partial resection, no recurrence was seen. The ulcerated polypoid mass was composed of compact spindle-cell proliferation with invasion of underlying muscle and fat. Atypical stromal cells were present in the myxoid areas. The surface edematous stroma contained abundant granulation tissue-type vascularity and a mixed population of chronic inflammatory cells. On immunohistochemical study, the spindle cells were consistent with myofibroblasts. The morphologic features, proliferating cell type, and benign clinical course are identical to the post-operative spindle cell nodules that occur in the genitourinary tract. ( info) |
| BACKGROUND: Infantile myofibromatosis is the most common fibrous disorder of infancy and childhood. It may occur in two distinct forms: multicentric and solitary. In both cases involvement of the central nervous system (CNS) is unusual: brain myofibromas are usually intracranial in proximity of the dura mater, with infiltration of the calvarial bones and secondary brain compression. spine myofibromas are exceptional and most of the cases reported in the literature represent secondary locations of visceral lesions. The natural history of myofibromas of the CNS in infantile myofibromatosis is characterized by a period of rapid growth, subsequent stabilization, and spontaneous regression in many cases. On these grounds surgical treatment is reserved for lesions that compress the brain or spinal cord and show an obvious progression. Small lesions or tumor residuals in asymptomatic children without visceral involvement should be closely observed as first choice. CASE REPORT: We report the case of a 10-month-old child with a solitary intramedullary myofibroma, extended from C7 to the conus. The patient underwent partial surgical removal of this lesion. Control MRI has shown the spontaneous slow reduction of the tumor residual and a progressive improvement of preoperative neurological conditions has been observed. To our knowledge this is the first case in which a solitary myofibroma was localized within the spinal cord. ( info) |
4/4. Coexistence of spindle cell lipoma and ordinary lipoma. We report a patient with a spindle cell lipoma on the nape and three ordinary lipomas on the abdomen and extremities. The coexistence of spindle cell lipoma and ordinary lipoma in a single patient is rare. Abundant CD34-positive spindle cells and mast cells were found in the spindle cell lipoma, but in the ordinary lipomas, only a small number of CD34-positive spindle cells were found in the interstitial connective tissue and no mast cells were seen. Because mast cells are known to stimulate mesenchymal cell proliferation and collagen production, mast cell infiltration may be a trigger for the proliferation of CD34-positive spindle cells, leading to the conversion of ordinary lipoma into spindle cell lipoma. ( info) |