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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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.
The storiform pattern that may be seen in sarcomatoid DMM is lacking in benign pleuritis.
Malignant fibrous histiocytoma is characterized by a mixture of spindle (fibrous) cells and round (histiocytic) cells arranged in a storiform pattern, with frequent giant cells and areas of pleomorphism.
This differs from the sarcomatous pattern of YST due to the lack of myxoid stroma, presence of a storiform pattern and the more striking cytologic atypia, as seen in our case.
1,12) In contrast to dermatofibrosarcoma protuberans, superficial acral fibromyxomas lack this storiform pattern and infiltration into the subcutis.
The overall histologic architecture was fascicular with a whorled, storiform pattern focally (figure 2).
The cells showed a typical storiform pattern (Fig 2) but with a higher mitotic activity and more atypia than in the previous lesions.
5) The sarcomatous portion is typically composed of undifferentiated, spindle-shaped cells arranged in a fascicular or storiform pattern (Figure, B).
Solid areas that resemble high-grade sarcoma, with a herringbone or storiform pattern, can be pres ent.
A second subtype is dominated by storiform cellularities in the stroma and small amounts of osteoids and bony trabeculae; some cells in the storiform pattern may be compared with potential osteoblasts.