Classic Type Atypical Fibroxanthoma

A morphologic variant of fetal rhabdomyoma characterized by the presence of a prominent myxoid stroma and primitive skeletal spindle cells.

A medulloblastoma composed of malignant cells with hyperchromatic nucleus and scanty cytoplasm. Homer Wright rosettes may be present.

A vascular sarcoma that commonly occurs in the lower extremities. It occurs predominantly in elderly male patients of southern European ancestry. It…

A congenital mesoblastic nephroma characterized by the presence of interlacing fascicles of fibroblastic cells, low mitotic activity, and collagen formation.

Collapse of the Maya civilization that occurred between 800 and 900 A.D.. Symptoms of the collapse included abandonment of the countryside and…

Mature B cell, lymphoblastic, starry sky effect