A Rare Case of Pilomatricoma of the Male Breast Mimicking Breast Carcinoma: A Diagnostic Challenge
Bibliographic record
Abstract
Pilomatricoma is a benign skin adnexal tumour often seen in children and young adults. We report a rare case of pilomatricoma of the breast in a 65-year-old male patient who presented with a palpable breast lump. Initial clinical and radiological evaluation suggested primary breast carcinoma. Histopathological examination showed classic features of a benign pilomatricoma with basaloid matrical cells, shadow (ghost) cells, and a foreign body giant cell reaction. There was only minimal microcalcification present. There was strong and diffuse nuclear and cytoplasmic staining of basaloid matrical cells for beta-catenin. This case highlights the diagnostic challenges posed by uncommon breast masses and emphasises the need for histologic confirmation by a tissue biopsy. Pathologists and clinicians should be aware that although pilomatricoma is a common skin adnexal tumour in the head and neck region, it can rarely present as a breast lump. Recognising this uncommon presentation is essential to avoid misdiagnosis and ensure appropriate management.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.005 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.005 | 0.002 |
| Insufficient payload (model declined to judge) | 0.002 | 0.002 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".