[Squamous cell carcinoma arising in a papillary carcinoma of the thyroid: a case report].

Background: primary squamous cell carcinoma (scc) of the thyroid is a rare malignant tumor that needs to be distinguished from other neoplasms. Cases of papillary carcinoma merging in association with squamous cell carcinoma are extremely rare.

Aim: the characteristics of such association will be studied herein through a review of literature.

Matrix-producing breast carcinoma: a case report of this rare entity.

Matrix-producing carcinoma of the breast is very rare with few cases reported in the literature. This entity is characterized by the association of malignant epithelial elements and a mesenchymal component. Therapeutic strategy is not well established and prognostic factors need further research.