69 year-old female with 5 cm left thyroid mass. Insular variant of poorly differentiated thyroid carcinoma	William C Faquin M.D.,PhD
	6 year-old female with lymphadenopathy and bilateral thyroid masses. Diffuse sclerosing variant of papillary thyroid carcinoma	William C Faquin M.D.,PhD
	70 year old female with 5 cm mass involving right pyriform sinus and larynx Basaloid squamous cell carcinoma	William C Faquin M.D.,PhD
	Orbital tumor. Subconjunctival herniated orbital fat	G.Petur Nielsen M.D
	Foot mass Hemosiderotic fibrolipomatous tumor	G.Petur Nielsen M.D
	What is the location ? Finger (Superficial acral fibromyxoma)	G.Petur Nielsen M.D
	Retroperitoneal mass. Sclerosing extramedullary hematopoietic tumor	G.Petur Nielsen M.D
	Soft tissue tumor Dedifferentiated metastatic malignant melanoma	G.Petur Nielsen M.D

 
Insular/trabecular patterns, occasional mitoses, nuclear features different from typical papillary carcinoma.

Numerous psammoma bodies and morule formation, in Hashimoto thyroiditis-like dense lymphocytic and sclerotic background


Comedo necrosis and numerous mitoses in basaloid cells


The lesion contains floret cells that may mimic pleomorphic lipoma and atypical lipomatous tumor.


A hemosiderotic fibrohistiocytic lipomatous lesion, or hemosiderotic fibrolipomatous tumor.
Consistent t(1;10) with rearrangements of TGFBR3 and MGEA5 in both myxoinflammatory fibroblastic sarcoma and hemosiderotic fibrolipomatous tumor.


Bland spindle cells with CD34 and EMA positivity


Large cells were Megakryocytic cells, as seen in original myeloproliferative disorders.


All melanoma markers including S-100 were negative ("dedifferentiated"). BRAF+ as was previous malignant melanoma of the skin.