Small-blue-round-cell tumor
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File:Ewepath20x.JPG
Small blue round cells of Ewing Sarcoma
In histopathology, a small-, round-, blue-cell tumor (abbreviated SRBCT), also known as a small-blue-round-cell tumour (SBRCT) or a small-round-cell tumour (SRCT), is any one of a group of malignant neoplasms that have a characteristic appearance under the microscope, i.e. consisting of small round cells that stain blue on routine H&E stained sections.
These tumors are seen more often in children than in adults. They typically represent undifferentiated cells. The predominance of blue staining is because the cells consist predominantly of nucleus, thus they have scant cytoplasm.[1][2]
Examples
Tumors that belong to this group are:
- Desmoplastic small-round-cell tumour
- Ewing's Sarcoma/PNET[3]
- Neuroblastoma[3]
- Medulloblastoma
- Rhabdomyosarcoma[3]
- Synovial sarcoma
- Carcinoid tumor
- Mesothelioma
- Small cell lung cancer
- Wilms' tumour[1]
- Retinoblastoma[citation needed]
- Small-cell lymphoma[3]
- Hepatoblastoma[3]- only the anaplastic form has round blue cells, the more common fetal and embryonal types do not [4]
- Merkel cell carcinoma
- Mesenchymal chondrosarcoma
Mimics
Endometrial stromal condensation may mimic a small-blue-round-cell tumour.
