Alveolar soft part sarcoma is an unusual tumor with highly characteristic histopathology and ultrastructure, controversial histogenesis, and enigmatic clinical behavior (Lieberman et al., 1989; Ordonez, 1999). The typical histology of ASPS shows well-defined nests of cells with abundant pink cytoplasm. The loss of central cohesion produces a pseudoalveolar appearance (Ladanyi et al., 2001). [from
OMIM]