Keratin and Vimentin Expression in Carcinomas and Mesenchymal Tumors Carcinomas That Frequently Express Both Renal cell carcinoma Anaplastic thyroid carcinoma Endometrial carcinoma Thyroid carcinoma Sarcomatoid carcinoma Mesothelioma Myoepithelial carcinoma Metaplastic breast carcinoma Carcinomas That Rarely Express Both Breast carcinoma Ovarian carcinoma Gastrointestinal carcinoma Lung small cell carcinoma Lung non-small cell carcinoma Prostate carcinoma Mesenchymal Tumors That Frequently Express Both Synovial sarcoma Desmoplastic small round blue cell tumor
Epithelioid sarcoma Epithelioid angiosarcoma Malignant rhabdoid tumor Leiomyosarcoma Chordoma Adamantinoma Table 4.
Ultrasound-guided biopsy showed a small round blue cell tumor
Primitive Neuro Ectodermal Tumor (PNET) is a malignant small round blue cell tumor
exhibiting a variable degree of neural differentiation, which arises outside the brain, spinal cord and sympathetic nervous system.
The differential diagnosis based on imaging findings may include rhabdomyosarcoma, Wilms tumor, carcinoid tumor, neuroblastoma, lymphoma, and desmo-plastic small round blue cell tumor.
The list includes blastemal predominant Wilms tumor, lymphoblastic lymphoma, synovial sarcoma, solid variant of alveolar rhabdomyosarcoma, clear cell sarcoma of the kidney, neuroblastoma, desmoplastic small round blue cell tumor, and small cell carcinoma.
Based on above findings, a cytologic diagnosis of a small round blue cell tumor
was given and we requested a USG-guided biopsy for classification and subtyping of tumor.
A review of literature, reveals several cases of pilomatrixoma misinterpreted as trichilemmal cyst, epidermal inclusion cyst, granulomatous lesions, squamous and basal cell carcinoma, lymphomas, small round blue cell tumor
, salivary gland and other appendageal tumors.
A striking finding in this study is the specificity of PHOX2B for NB in the small round blue cell tumor
differential of childhood.
This tumor should be distinguished from retinoblastoma and medulloepithelioma as a rare, primary intraocular small round blue cell tumor
Immunohistochemistry is performed to further substantiate the diagnosis and rule out possible mimics, especially in high grade tumors with non-classical features and resembling small round blue cell tumors
The small round blue cell tumors
of the sinonasal area: histological and immunohistochemical findings.
The homogenous morphology of MCC may also be confused with that of small round blue cell tumors
such as Ewing sarcoma/primitive neuroectodermal tumor (PNET).