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| Code | Diagnosis | Comment | Score |
| anonymous | Chordoid meningioma (70%), atypical teratoid/rhabdoid tumour (AT/RT)(30%) | Chordoid meningioma: EMA+, CK-, S100 variable Atypical teratoid/rhabdoid tumour: loss of expression of INI 1, EMA+, CK+, GFAP+ | 100 |
| anonymous | Chordoid meningioma | nil | 50 |
| anonymous | 1. Rhabdoid meningioma (50%) 2. Atypical teratoid/rhabdoid tumour (30%) 3. Chordoid meningioma (20%) | Perform immunohistochemistry for INI-1. If tumour cells are negative for INI-1, the diagnosis will be atypical teratoid/rhabdoid tumour. | 100 |
| anonymous | Epithelioid hemangioendothelioma 40% Chordoid meningioma 40% Atypical teratoid rhabdoid tumor 20% | Immunostaining for: CD31, CD34, ERG - positive in epithelioid hemangioendothelioma EMA - positive in maningioma INI1 - lost in atypical teratoid rhabdoid tumor. | 100 |
| anonymous | Chordoid meningioma, grade 2 (WHO), with brain invasion. 100% | Dx can be confirmed by EMA+. Brain invasion can be confirmed and highlighted by background GFAP stain. | 50 |
| anonymous | Rhabdoid neoplasm Atypical teratoid/rhaboid tumor vs Rhabdoid meningioma | ATRT is characterized by loss of INI1 stain, while rhabdoid meningioma shows retained nuclear stain of INI1 stain in the tumor cells | 100 |
| anonymous | Malignant (Ansplastic) Meningioma (WHO Grade III) 100% | There are chordoid areas and foci of dubious rhabdoid cell configuration | 50 |
| anonymous | Atypical teratoid/rhabdoid tumour 50% Chordoid meningioma WHO G2 50% | perform immunostain for INI1 to cofirm ATRT vs meningeal differentiation. | 100 |
| anonymous | 70% chordoid meningioma 30% ATRT (atypical teratoid/rhabdoid tumour) | nil | 100 |
| anonymous | Favoring Atypical Epithelioid Haemangioendothelioma. Differential diagnosis - Chordoid meningioma. | nil | 50 |
| anonymous | Left temporal tumor:- Myxoid tumour with neoplastic cells having rhabdoid morphology, differential diagnoses including: 1) Meningioma, chordoid/rhabdoid variant, WHO grade III (probability 50%) 2) Atypical teratoid/rhabdoid tumor, WHO grade IV (probability 50%) | Definitive diagnosis cannot be made without support of immunohistochemistry: 1) Meningioma, chordoid/rhabdoid variant (WHO grade III) - confirmed by positive EMA stain 2) Atypical teratoid/rhabdoid tumor (WHO grade IV) - confirmed by loss of INI-1 by immunostain | 100 |
| anonymous | Atypical teratoid rhabdoid tumor. | nil | 100 |
| anonymous | Malignant neoplasm with chordoid features, with the differential diagnosis including atypical teratoid/rhabdoid tumour (70%) and chordoid meningioma (30%). | Immunohistochemical staining would be performed, including INI1, EMA and GFAP. INI1 would be negative in atypical teratoid/rhabdoid tumour and positive in chordoid meningioma. For chordoid meningioma the expected pattern is EMA positive, GFAP negative. | 100 |
| anonymous | atypical teratoid/rhabdoid tumor (100%) | nil | 100 |
| anonymous | Brain ?Malignant neoplasm, differential diagnoses included Chordoid meningioma and Atypical teratoid and rhabdoid tumor, need to perform immunohistochemistry of keratin and molecular study of INI1. (100% probability). | nil | 100 |
| anonymous | Chordoid Meningioma | nil | 50 |
| anonymous | Chordoid meningioma, grade II (WHO) 100% | nil | 50 |
| anonymous | Chordoid meningioma. W.H.O. Grade 2. | nil | 50 |