PAX-5

CD79a

DDX of superficial pediatric small round blue cell tumors are sarcomas (Ewing family and fusion-associated); rhabdomyosarcoma; lymphomas/leukemias; neuroblastoma #dermpath #surgpath #blueskypath #blueskydermpath #blueskysurgpath #hemepath #blueskyhemepath #pathology #blueskypathology

Hypercellular basophilic tumor with closely packed glandular architecture.

The closely packed "glands" contain dense eosinophilic material and are lined by monotonous cells.

PAX-8 is positive.

Thyroglobulin is positive.

Metastatic thyroid carcinoma to the scalp. #dermpath #surgicalpath #blueskypath #blueskypathology #blueskydermpath #immunohistochemistry #pathology