{
  "id": 607187,
  "title": "Question: Clarification on the number of aneurysms in train.csv vs. train_localizers.csv",
  "url": "/competitions/rsna-intracranial-aneurysm-detection/discussion/607187",
  "author_name": "hikaggler",
  "post_date": "2025-09-12T11:03:20.311000",
  "votes": 0,
  "comment_count": 3,
  "views": 0,
  "content": "<p>Hi everyone,</p>\n<p>I'm new to this competition and had a question about the data structure. I noticed that train.csv contains 2,172 unique aneurysms (some patients have more than one aneurysm), while train_localizers.csv has 2,249 columns.</p>\n<p>Could someone please clarify what causes this difference?</p>\n<p>Thank you in advance!</p>",
  "messages": [
    {
      "id": 3288000,
      "postDate": "2025-09-12T19:10:47.787Z",
      "content": "<p>The 'train.csv' master file contains a binary flag for each location where aneurysms may be present. For the localizer data file, we have entries for each specific aneurysm, with its location and coordinates; there may be more than a single aneurysm per location.</p>",
      "rawMarkdown": "The 'train.csv' master file contains a binary flag for each location where aneurysms may be present. For the localizer data file, we have entries for each specific aneurysm, with its location and coordinates; there may be more than a single aneurysm per location.",
      "replies": [
        {
          "id": 3288234,
          "postDate": "2025-09-13T12:41:38.683Z",
          "content": "<p>Thanks Jason!</p>\n<p>As an example, if a patient had 2 left MCA aneurysms, this would be marked as positive (1) in the left MCA aneurysm field, but there would be 2 corresponding entries in train_localizers corresponding to the 2 different left MCA aneurysm locations.</p>",
          "rawMarkdown": "Thanks Jason!\n\nAs an example, if a patient had 2 left MCA aneurysms, this would be marked as positive (1) in the left MCA aneurysm field, but there would be 2 corresponding entries in train_localizers corresponding to the 2 different left MCA aneurysm locations."
        }
      ]
    },
    {
      "id": 3287851,
      "postDate": "2025-09-12T12:39:35.500Z",
      "content": "<p>Some aneurysm are multiple tagged. I mean, some diagnostics have multiple clustered annotations.</p>",
      "rawMarkdown": "Some aneurysm are multiple tagged. I mean, some diagnostics have multiple clustered annotations."
    },
    {
      "id": 3287813,
      "postDate": "2025-09-12T11:03:20.310Z",
      "content": "<p>Hi everyone,</p>\n<p>I'm new to this competition and had a question about the data structure. I noticed that train.csv contains 2,172 unique aneurysms (some patients have more than one aneurysm), while train_localizers.csv has 2,249 columns.</p>\n<p>Could someone please clarify what causes this difference?</p>\n<p>Thank you in advance!</p>",
      "rawMarkdown": "Hi everyone,\n\nI'm new to this competition and had a question about the data structure. I noticed that train.csv contains 2,172 unique aneurysms (some patients have more than one aneurysm), while train_localizers.csv has 2,249 columns.\n\nCould someone please clarify what causes this difference?\n\nThank you in advance!"
    }
  ],
  "comments": [
    {
      "id": 3288000,
      "author_name": "Jason Sho",
      "author_url": "",
      "post_date": "2025-09-12T19:10:47.787000",
      "content": "<p>The 'train.csv' master file contains a binary flag for each location where aneurysms may be present. For the localizer data file, we have entries for each specific aneurysm, with its location and coordinates; there may be more than a single aneurysm per location.</p>",
      "votes": 0,
      "replies": [
        {
          "id": 3288234,
          "author_name": "Evan Calabrese",
          "author_url": "",
          "post_date": "2025-09-13T12:41:38.683000",
          "content": "<p>Thanks Jason!</p>\n<p>As an example, if a patient had 2 left MCA aneurysms, this would be marked as positive (1) in the left MCA aneurysm field, but there would be 2 corresponding entries in train_localizers corresponding to the 2 different left MCA aneurysm locations.</p>",
          "votes": 0,
          "replies": []
        }
      ]
    },
    {
      "id": 3287851,
      "author_name": "Ángel Jacinto Sánchez Ruiz",
      "author_url": "",
      "post_date": "2025-09-12T12:39:35.500000",
      "content": "<p>Some aneurysm are multiple tagged. I mean, some diagnostics have multiple clustered annotations.</p>",
      "votes": 0,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "3288000": "The 'train.csv' master file contains a binary flag for each location where aneurysms may be present. For the localizer data file, we have entries for each specific aneurysm, with its location and coordinates; there may be more than a single aneurysm per location.",
    "3287851": "Some aneurysm are multiple tagged. I mean, some diagnostics have multiple clustered annotations.",
    "3287813": "Hi everyone,\n\nI'm new to this competition and had a question about the data structure. I noticed that train.csv contains 2,172 unique aneurysms (some patients have more than one aneurysm), while train_localizers.csv has 2,249 columns.\n\nCould someone please clarify what causes this difference?\n\nThank you in advance!"
  }
}