Search Results for epithelioid

EPITHELIOID HEMANGIOENDOTHELIOMA Figure 1-115 EPITHELIOID HEMANGIOENDOTHELIOMA Modestly atypical spindled and epithelioid cells are set in a fibromyxoid stroma. Some of the cells exhibit primitive vessel formation in the form of cytoplasmic vacuoles, some of which contain red blood cells. Inset More about this image found in EPITHELIOID HEMANGIOENDOTHELIOMA Modestly atypical spindled and epithelioi...

ANGIOSARCOMA Figure 1-123 ANGIOSARCOMA A: Pleomorphic epithelioid cells form blood-filled vascular spaces. B: Endothelial markers like CD31 (pictured here), CD34, and ERG are confirmatory. More about this image found in ANGIOSARCOMA A: Pleomorphic epithelioid cells form blood-filled vascular s...

EPITHELIOID MALIGNANT PERIPHERAL NERVE SHEATH TUMOR Figure 1-125 EPITHELIOID MALIGNANT PERIPHERAL NERVE SHEATH TUMOR A: Solid nests of undifferentiated epithelioid cells are seen. B,C: In contrast to conventional malignant peripheral nerve sheath tumor, the epithelioid subtype is diffusely More about this image found in EPITHELIOID MALIGNANT PERIPHERAL NERVE SHEATH TUMOR A: Solid nests of undi...

MENINGIOMA Figure 1-160 MENINGIOMA A: Meningothelial type with whorls of spindled and epithelioid cells. B: The whorls of meningothelial cells have an epithelioid quality. C: Islands of meningioma with intranuclear cytoplasmic inclusions. A psammoma body is present (black arrow). D: A fibrous More about this image found in MENINGIOMA A: Meningothelial type with whorls of spindled and epithelioid ...

EPITHELIOID HEMANGIOMA Figure 8-23 EPITHELIOID HEMANGIOMA A: Multiple papules have coalesced into a larger nodule distorting the scaphoid. (Courtesy of Dr. M. Gurlanick, Woodland Hills, CA) B: Computerized tomography (CT) demonstrates a soft tissue mass involving the ear and preauricular region More about this image found in EPITHELIOID HEMANGIOMA A: Multiple papules have coalesced into a larger no...

EPITHELIOID HEMANGIOMA Figure 8-24 EPITHELIOID HEMANGIOMA A,B: There is a polypoid appearance to the proliferation (A), in which the rich vascularity and lymphoid components (B) are easily identified. Ceruminous glands are adjacent. More about this image found in EPITHELIOID HEMANGIOMA A,B: There is a polypoid appearance to the prolifer...

EPITHELIOID HEMANGIOMA Figure 8-25 EPITHELIOID HEMANGIOMA A: An intact epidermis is separate from the richly vascularized tumor. B: The vessels are haphazardly distributed, with prominent endothelial cells and a rich eosinophilic infiltrate. C: The mixed lymphoid and eosinophilic infiltrate More about this image found in EPITHELIOID HEMANGIOMA A: An intact epidermis is separate from the richly ...

EPITHELIOID HEMANGIOMA Figure 8-26 EPITHELIOID HEMANGIOMA A: Large vessels have a hobnail endothelial pattern. B: A blister cell (black arrow) is noted in this partially open vessel. C: The epithelioid appearance of the endothelial cells is easily identified, along with a mitotic figure (black More about this image found in EPITHELIOID HEMANGIOMA A: Large vessels have a hobnail endothelial pattern...

PECOMA Figure 1-66 PECOMA A,B: PEComa is in the differential diagnosis of leiomyoma, identified below an intact epithelium. The epithelioid and spindled cells are associated with vessels; cleared to granular cytoplasm is present in cells with prominent nucleoli. More about this image found in PECOMA A,B: PEComa is in the differential diagnosis of leiomyoma, identifi...

MUCOSAL MELANOMA Figure 1-152 MUCOSAL MELANOMA A variety of cytologic features can be seen in melanoma, including vesicular chromatin (A), epithelioid (B), polygonal (C), spindled (D), undifferentiated (E), and primitive (F) patterns. More about this image found in MUCOSAL MELANOMA A variety of cytologic features can be seen in melanoma, ...

LYMPHOEPITHELIAL CARCINOMA Figure 6-66 LYMPHOEPITHELIAL CARCINOMA A,B: The biopsy shows a high nuclear to cytoplasmic ratio, malignant epithelioid cells with vesicular nuclei, and distinct nucleoli with a surrounding lymphoplasmacytic infiltrate. C: Malignant cells are positive for CK5/6. More about this image found in LYMPHOEPITHELIAL CARCINOMA A,B: The biopsy shows a high nuclear to cytopla...

MENINGIOMA Figure 8-107 MENINGIOMA A: Meningothelial whorls are noted within the center of a bony fragment. B: Meningothelial to spindled proliferation with a large psammoma body. C: A syncytial appearance with vague whorling. D: Meningothelial growth with an epithelioid appearance and early More about this image found in MENINGIOMA A: Meningothelial whorls are noted within the center of a bony ...

PitNET Figure 1-169 PitNET There is a wide spectrum of cytomorphologic appearances, including: epithelioid (A), neuroendocrine small round blue cell (B), slightly eosinophilic, granular cytoplasm (C), oncocytic cells (D), syncytial appearance with nuclear smudging (E), and isolated pleomorphic More about this image found in PitNET There is a wide spectrum of cytomorphologic appearances, including:...

MUCOSAL MELANOMA Figure 4-57 MUCOSAL MELANOMA A: Atypical melanocytes in the basal layer spread laterally in the radial growth phase. B: Pagetoid spread in the epithelium, with a nested epithelioid growth pattern in the stroma. C: Pseudoepitheliomatous hyperplasia overlying spindle-shaped More about this image found in MUCOSAL MELANOMA A: Atypical melanocytes in the basal layer spread lateral...

deposit with eosinophils. D: A necrotizing granuloma with epithelioid histiocytes and eosinophils is noted in the subcapsular sinus. More about this image found in KIMURA DISEASE A: Heavy fibrosis dissects the lymph node into nodules, wit...

SOLITARY FIBROUS TUMOR Figure 1-94 SOLITARY FIBROUS TUMOR A: Hypocellular and hypercellular areas with bland spindled cells. B: More epithelioid to rounded cells are seen in some cases. C: Brightly, hypereosinophilic collagen bundles separate bland spindled cells. D: Delicate chromatin More about this image found in SOLITARY FIBROUS TUMOR A: Hypocellular and hypercellular areas with bland ...

with finely stippled chromatin. B: The larger cell type is “epithelioid,” with abundant, finely granular melanin pigment in the cytoplasm and vesicular nuclei. More about this image found in MELANOTIC NEUROECTODERMAL TUMOR OF INFANCY A: Biphasic population of cells...

SMARCB1-DEFICIENT SINONASAL CARCINOMA Figure 1-37 SMARCB1-DEFICIENT SINONASAL CARCINOMA A: The tumor is an infiltrative epithelioid proliferation of undifferentiated-appearing cells. B: Empty vacuoles are often seen, which can be a helpful diagnostic clue. C: The tumor cells have More about this image found in SMARCB1-DEFICIENT SINONASAL CARCINOMA A: The tumor is an infiltrative epit...

proliferation intimately associated with the surface epithelium, mimicking spindle squamous cell carcinoma. C: High-power view of the spindle cells demonstrate a fascicular growth pattern with marked nuclear pleomorphism. D: Epithelioid and round cells with multiple atypical nuclei. (Courtesy of Dr. R. Foss More about this image found in RHABDOMYOSARCOMA WITH TFCP1 REARRANGEMENT (RMS-TFCP2) A: ...