Storiform Pattern

A pattern seen by low-power light microscopy, which is characterised by loosely-arranged whorls of elongated, spindled fibroblast-like cells. The highly nonspecific storiform pattern is often seen in fibrohistiocytic lesions. It may be benign—e.g., dermatofibroma, giant cell tumour of tendon sheath—of low malignant potential—e.g., atypical fibroxanthoma, dermatofibrosarcoma protuberans—or malignant—e,g, fibrosarcoma; it may also be seen in non-histiocytic lesions—e.g., nodular fascitis, leiomyoma, leiomyosarcoma, Schwann cell tumours, spindle cell carcinoma
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17] It is usually solitary and has relative hypocellularity with a prominent feature that thick collagen bundles are arranged in a storiform pattern.
The cellular fibrostroma consists of plump fibroblastic spindle cells arranged in fascicular to storiform pattern with basophilic nuclei.
plasma cells and often increased eosinophils; (2) a storiform pattern of fibrosis; and (3) obliterative vasculitis.
1,6] Histopathology confirms the diagnosis, yet scenario may sometimes get convoluted microscopically - marked by chronic inflammation, necrosis, haemorrhage, infiltration into serosa, foamy macrophages, spindle-shaped xanthoma cells in storiform pattern and exuberant fibrosis.
A 4 mm biopsy of a skin nodule on his trunk revealed an atrophic epidermis and a grenz zone below the epidermis with a nodular infiltrate located mostly in the mid dermis, but extending until the subcutis and composed mainly by a spindle-shaped histiocytes arranged in a storiform pattern.
The fibrocytes were monomorphous, elongated and spindle shaped, arranged in a storiform pattern.
Microscopy showed spindled cells arranged in a tight storiform pattern admixed with scattered heavily pigmented cells (Figure 2).
It was composed of proliferating fibroblasts arranged in a prominent storiform pattern with mitotic activity (seven mitoses per 10 high-power fields) [Figure 1 and 2].
Histological examination showed fascicles of hypercellular spindle cells with mitotic figures measuring up to 22/10 HPF, focal necrosis, focal storiform pattern, and staghorn-like vascular pattern, which compatible with HPC [Figure 5].
Microscopic examination of the removed specimen revealed a cellular lesion characterized by a proliferation of uniform spindle-shaped cells in a vague but prominent storiform pattern, which represented the classic appearance of nonossifying fibroma.
The histopathological report showed an arrangement of spindle cells in a storiform pattern with Verocay bodies interspersed with myxomatous areas.
Microscopic examination showed that the tumor was composed of elongated spindle cells displaying a patchy and a faint storiform pattern.