A Method to Represent Heterogeneous Materials for Rapid Prototyping: The Matryoshka Approach.

Purpose: The purpose of this paper is to present a new method for representing heterogeneous materials using nested STL shells, based, in particular, on the density distributions of human bones.

Design/methodology/approach: Nested STL shells, called Matryoshka models, are described, based on their namesake Russian nesting dolls. In this approach, polygonal models, such as STL shells, are "stacked" inside one another to represent different material regions.

A computational/experimental platform for investigating three-dimensional puzzle solving of comminuted articular fractures.

Reconstructing highly comminuted articular fractures poses a difficult surgical challenge, akin to solving a complicated three-dimensional (3D) puzzle. Preoperative planning using computed tomography (CT) is critically important, given the desirability of less invasive surgical approaches. The goal of this work is to advance 3D puzzle-solving methods towards use as a preoperative tool for reconstructing these complex fractures.

An unusual case of peripheral T-cell lymphoma with CD56 positivity and angiocentric, angiodestructive morphology arising in the ileum.

Natural killer cell and cytotoxic T-cell lymphomas are frequently difficult to distinguish because they share many common features, and yet it is important to make an accurate diagnosis because their prognoses differ. We report an unusual case of a white man with a CD56-positive T-cell lymphoma in the ileum. The histologic pattern was characterized by angioinvasion and angiodestruction.