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arxiv: 2606.21290 · v1 · pith:XZKJBPSJ · submitted 2026-06-19 · cs.CV

NoduLoCC2026: Lung Nodule Localization and Classification Contest from Chest X-Ray Images

Reviewed by Pith T0 review T1 audit T2 compute T3 formal T4 kernel 2026-06-26 14:50 UTCgrok-4.3pith:XZKJBPSJrecord.jsonopen to challenge →

classification cs.CV
keywords lung nodulechest X-rayclassificationlocalizationmedical imaging challengeobject detection
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The pith

A challenge on chest X-ray images shows classification of lung nodules reaches moderate accuracy while localization stays limited.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper organizes NoduLoCC2026 as a contest supplying datasets for two tasks: deciding whether nodules are present and marking their exact positions. Five teams entered solutions that the organizers evaluated on a held-out external test set. Classification produced the stronger results, with the leading entry at 0.72 balanced accuracy and 0.79 AUC-ROC. Localization proved harder: the best entry matched the true nodule count in only 53 percent of cases and placed centers at a median Euclidean error of 12.83 mm.

Core claim

Results from the NoduLoCC2026 submissions establish that current methods can classify the presence of lung nodules in chest X-rays at balanced accuracy 0.72 and AUC-ROC 0.79, yet the same approaches identify the correct number of nodules in just 53 percent of external test images and locate them with a median distance error of 12.83 mm, confirming localization as the more difficult task.

What carries the argument

The NoduLoCC2026 dataset together with its dual evaluation protocol that scores classification by balanced accuracy and AUC-ROC while scoring localization by nodule-count match rate and median Euclidean distance.

Load-bearing premise

The external test dataset is representative of real clinical variability and the chosen metrics capture clinical utility.

What would settle it

A follow-up test collection drawn from different hospitals or scanners that drops the leading method's balanced accuracy below 0.60 or its correct-count rate below 40 percent.

Figures

Figures reproduced from arXiv: 2606.21290 by Adnane Cabani, Adnan Mustafic, Agnese Sbrollini, Chiara Bentifece, Cl\'ement Bardin, Cyril Meyer, Diedre Carmo, Fahima Idiri, Farid Meziane, Halim Benhabiles, Hicham Messaoudi, Ilaria Marcantoni, Karim Hammoudi, K\'evin Bouchard, Kristhian Andr\'e Oliveira Aguilar, Laura Burattini, L\'eonard Zipper, L\'eon Morales, Let\'icia Rittner, Marin Boehm, Matthis Lahargoue, Romain Amigon.

Figure 1
Figure 1. Figure 1: Log scale data distribution chart for the [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Team CM@MSD’s classification pipeline. The approach utilizes an ensemble of EfficientNet [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Team LAiB’s classification and localization approach. The classification phase employs a [PITH_FULL_IMAGE:figures/full_fig_p005_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Team LIMED’s two-phase cascaded pipeline. Phase 1 (Classification) fine-tunes a RadDINO ViT [PITH_FULL_IMAGE:figures/full_fig_p008_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: Team MICLab’s Vision-Language Model (VLM) pipelines. The classification pipeline fine-tunes [PITH_FULL_IMAGE:figures/full_fig_p008_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: Team UQAC’s cascaded dual-reader decision pipeline. Phase 1 (Classification) utilizes an [PITH_FULL_IMAGE:figures/full_fig_p010_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: ROC Curves for the classification task on [PITH_FULL_IMAGE:figures/full_fig_p011_7.png] view at source ↗
read the original abstract

We propose NoduLoCC2026, a challenge on lung nodule detection and localization in chest X-ray images. We have provided a dataset for both tasks and received submissions from 5 international teams. The participating teams' solutions are presented in this work along with results on an external dataset used for testing. Proposed methods show good performance on the classification task. The best method shows a balanced accuracy score of 0.72 and AUC-ROC of 0.79. We highlight the limitations of current approaches for the localization task, with the best approach having predicted the correct number of nodules on 53\% of the test images with a median distance of 12.83mm, showing that it is a more challenging task than the first one. The challenge website is available via https://gt-i2mdp.github.io/website/nodule_challenge.html.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 0 minor

Summary. The manuscript presents the NoduLoCC2026 challenge for lung nodule localization and classification from chest X-ray images. A dataset is provided for both tasks, submissions are received from 5 international teams, and the teams' solutions are evaluated on an external held-out test set. The best classification method achieves a balanced accuracy of 0.72 and AUC-ROC of 0.79; the best localization method predicts the correct nodule count on 53% of test images with a median Euclidean distance of 12.83 mm, indicating that localization remains more challenging.

Significance. If the dataset construction, annotation protocol, and test-set representativeness can be established, the work would provide a useful community benchmark that quantifies the current performance gap between classification and localization tasks on chest X-rays and could guide future method development.

major comments (3)
  1. [Abstract] Abstract: performance metrics (balanced accuracy 0.72, AUC-ROC 0.79, 53% correct nodule count, median distance 12.83 mm) are stated without any accompanying information on training or test dataset size, annotation protocol, inter-annotator agreement, or statistical testing, so the support for the headline claims cannot be verified.
  2. [Abstract] Abstract: the manuscript supplies no description or validation showing that the external test set matches real clinical distributions (patient demographics, imaging conditions, nodule appearance variability), which is load-bearing for the claim that the reported scores demonstrate method performance rather than dataset-specific artifacts.
  3. [Abstract] Abstract: no details are given on the five submitted methods, their architectural choices, training procedures, or comparisons against standard baselines, preventing assessment of whether the observed scores reflect meaningful progress.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the constructive feedback. We agree that the abstract requires expansion to provide necessary context and will revise it accordingly. We also address the need for additional discussion on test-set limitations and method details in the main text.

read point-by-point responses
  1. Referee: [Abstract] Abstract: performance metrics (balanced accuracy 0.72, AUC-ROC 0.79, 53% correct nodule count, median distance 12.83 mm) are stated without any accompanying information on training or test dataset size, annotation protocol, inter-annotator agreement, or statistical testing, so the support for the headline claims cannot be verified.

    Authors: We agree the abstract is overly concise. The manuscript body (Section 2) provides dataset sizes, annotation protocol by multiple radiologists, inter-annotator agreement metrics, and Section 5 includes statistical testing. We will revise the abstract to incorporate these key details and cross-references to the relevant sections. revision: yes

  2. Referee: [Abstract] Abstract: the manuscript supplies no description or validation showing that the external test set matches real clinical distributions (patient demographics, imaging conditions, nodule appearance variability), which is load-bearing for the claim that the reported scores demonstrate method performance rather than dataset-specific artifacts.

    Authors: We acknowledge that the manuscript does not include a formal validation or comparison of the external test set to broader clinical distributions. The test set was deliberately collected from a separate institution to create a challenging held-out evaluation. We will add a dedicated limitations paragraph in the discussion section addressing potential dataset shift and the absence of explicit demographic matching. revision: yes

  3. Referee: [Abstract] Abstract: no details are given on the five submitted methods, their architectural choices, training procedures, or comparisons against standard baselines, preventing assessment of whether the observed scores reflect meaningful progress.

    Authors: Section 4 of the manuscript summarizes the five submitted solutions, but we concur that greater technical depth is needed. We will expand this section with additional architectural and training details supplied by the teams and will include explicit comparisons against standard baselines (e.g., ResNet classifiers and Faster R-CNN detectors). revision: yes

Circularity Check

0 steps flagged

No circularity: empirical contest results from independent teams on held-out test set

full rationale

The paper reports classification and localization performance metrics (balanced accuracy 0.72, AUC-ROC 0.79, nodule count accuracy 53%, median distance 12.83 mm) obtained by external teams on an external test dataset. No equations, fitted parameters, derivations, or self-citations are used to define or predict these outcomes; the results are direct empirical measurements. No self-definitional, fitted-input, or uniqueness-imported patterns exist. The derivation chain is absent, rendering circularity analysis inapplicable.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Only the abstract is available; no mathematical derivations, fitted parameters, or new postulated entities appear in the provided text.

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