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arXiv · 2507.12427

Unit-Based Histopathology Tissue Segmentation via Multi-Level Feature Representation

Ashkan Shakarami·Azade Farshad·Yousef Yeganeh·Lorenzo Nicole·Peter Schüffler·Stefano Ghidoni·Nassir Navab
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Abstract

We propose UTS, a unit-based tissue segmentation framework for histopathology that classifies each fixed-size 32 * 32 tile, rather than each pixel, as the segmentation unit. This approach reduces annotation effort and improves computational efficiency without compromising accuracy. To implement this approach, we introduce a Multi-Level Vision Transformer (L-ViT), which benefits the multi-level feature representation to capture both fine-grained morphology and global tissue context. Trained to segment breast tissue into three categories (infiltrating tumor, non-neoplastic stroma, and fat), UTS supports clinically relevant tasks such as tumor-stroma quantification and surgical margin assessment. Evaluated on 386,371 tiles from 459 H&E-stained regions, it outperforms U-Net variants and transformer-based baselines. Code and Dataset will be available at GitHub.

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Ashkan Shakarami, Azade Farshad, Yousef Yeganeh, Lorenzo Nicole, Peter Schüffler, Stefano Ghidoni, Nassir Navab. 2025-07-16. Unit-Based Histopathology Tissue Segmentation via Multi-Level Feature Representation. https://arxiv.org/abs/2507.12427

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