纤维性和肌纤维性肿瘤的病理诊断.pptVIP

Cellular zone of a fibroma of the tendon sheath, including cleft-like spaces. * Pleomorphic fibroma of skin with scattered floret-like giant cells deposited in a densely collagenized dermis. * Low-power view of nuchal fibroma, characterized by a hypocellular, densely collagenized mass with scattered fibroblasts among skeletal muscle fibers. * Scattered fibroblasts deposited in densely collagenized stroma. * Low-magnification view of a Gardner-associated fibroma showing interdigitation of mature fat and dense collagen. * Densely collagenous area of Gardner-associated fibroma. * Elastofibroma. There is an intimate admixture of firm collagenous tissue with fat. * Elastofibroma. (A) Altered elastic fibers in a collagenous matrix. * Elastic fibers in cross-section showing a characteristic serrated edge (petaloid globules). * Masson trichrome stain of elastofibroma outlining the collagen surrounding the abnormal elastic fibers. Verhoeff elastin stain shows the mirror image, accentuating the abnormal elastic fibers. * High-power view of Verhoeff elastin stain showing elastic fibers with a dense core * Nasopharyngeal angiofibroma consisting of dense fibrocollagenous tissue with interspersed vascular channels of varying caliber. * Nasopharyngeal angiofibroma composed of cytologically bland fibroblasts deposited in a dense collagenous stroma. * Low-power view. * Keloid displaying thick, glassy eosinophilic fibers in fibroblastic tissue. * Desmoplastic fibroblastoma (collagenous fibroma). The lesion is hypocellular with widely spaced spindled and stellate-shaped cells embedded in a fibromyxoid stroma. * High-magnification view of bland spindled and stellate-shaped fibroblasts in a desmoplastic fibroblastoma (collagenous fibroma). * Low-power view of a fibrosarcoma exhibiting a distinct fascicular (herringbone) pattern. * Fibrosarcoma consisting of uniform spindle cells showing little variation in size and shape and a distinct fascicular pattern * Fibrosarcoma showing arrang