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| Code | Diagnosis | Comment | Score |
| anonymous | Malignant small round cell tumour, favour desmoplastic small round cell tumour (100%) | Tumour cells may be positive for CK, Desmin, EMA, vimentin and NSE. | 100 |
| anonymous | Malignant neurogenic tumor: Melanotic neuroectodermal tumor (50%). Neuroblastoma (50%) | nil | 50 |
| anonymous | Gastrointestinal stromal tumor (with possible post-Gleevac effect). 80% DDx: Schwannoma. 20% | More clinical history should be given in the first place! Is there a history of previous GIST? Treatment? The Dx of GIST is confirmed with +ve immunostains (CD117 & CD34) while S-100 protein positivity would be more in favour of a schwannoma. | 20 |
| anonymous | Desmoplastic small round cell tumor, 100%. | Confirm by immunohistochemical studies (cytokeratin, desmin and neurone specific enolase all positive. | 100 |
| anonymous | Small blue round cell tumor, consistent with intra-abdominal desmoplastic small round cell tumor 70%, ddx: small cell carcinoma 30%. | Confirm by CK+, NSE+, desmin+, SMA-, EWS-WT1 protein+. For small cell ca, CK+(punctate perinuclear), chromogranin+, synaptophysin+. Immunostains for other remote ddx eg. lymphoma, undifferentiated ca and melanoma(pigments+). | 100 |
| anonymous | Desmoplastic small round cell tumor.(100%) | Can do cytokeratin, vimentin, desmin and WT1 stains to help diagnosis. Or do RT-PCR for EWS-WT1 fusion gene transcript to confirm diagnosis. | 100 |
| anonymous | TREATED GASTROINTESTINAL STROMAL TUMOUR -100% | nil | 10 |
| anonymous | Malignant small blue cell tumour ddx: Neuroblastoma (70%), Ewing's sarcoma/PNET (20%), malignant melanoma (<10%), rhabdomyosarcoma (<10%), small cell carcinoma (<10%) | Perform immunohistochemical stain NSE, synaptophysin, chromogranin, neurofilament, CD 99, S-100 protein, HMB 45, BCK, desmin, myoglobin, myogenin | 60 |
| anonymous | Intra-abdominal desmoplastic small round cell tumour 100% | nil | 100 |
| anonymous | Schwannoma with presence of melanin and cellular area | nil | 10 |
| anonymous | Infiltration by malignant small round cell NEOPLASM | The histologic differential diagnoses include desmoplastic small round cell tumour, gastrointestinal stromal tumour and lymphoma. Immunohistochemcial stains like dismin, cytokeratin, NSE, CD34, c-kit and lymphoid markers are suggested for reaching a definitive diagnosis. The hyaline degeneration of subserosa and subserosal vessels is not typical and secondary changes like treatment effect induced by radiotherapy or chemotherapy needs to be considered. | 60 |
| anonymous | Small cell tumor | The differential disgnoses include primitive neuroectodermal tumor, desmoplastic small round cell tumor, small cell melanoma and small cell carcinoma. Suggest performing immunohistochemical study to differentiate - PNET would be postive for CD99, DSRCT for CD99, cytokeratin and smooth muscle markers, melanoma for S100 and HMB45, and small cell carcinoma for CAM5.2. | 60 |
| anonymous | Dx: small cell tumor. DDx: desmoplastic small round cell tumour and small cell carcinoma. Will perform epithelial, neuroendocrine and muscle marker. 100% Probability | nil | 80 |
| anonymous | Intra abdominal desmoplastic small round cell tumor. 100%. | t(11, 22) (p13: q12) cytogenetic finding for confirmation | 100 |
| anonymous | Small round cell tumor, favour desmoplastic small round cell tumor (100%) | Immunohistochemical staining for AE1/AE3, EMA, NSE, desmin, SMA, LCA. | 100 |