Atypical giant proliferating cystic pilomatrixoma: A case review
Bibliographic record
Abstract
Pilomatrixoma, or calcifying epithelioma of Malherbe, is a rare and benign tumour. Typical presentation of pilomatrixoma is solitary, firm lesions found in the head and neck regions. Pilomatrixoma are often misdiagnosed due to their clinical presentation, which is synonymous with other cutaneous pathology. The reported and true incidence of pilomatrixoma are 1% and 16%, respectively. Cystic pilomatrixoma is a unique variant that presents without the pathognomonic feature of a firm lesion. This study presents the case of a 52-year-old man with a post-auricular pilomatrixoma. It is erythematous, soft, mobile, and 4 cm in diameter. Its size categorizes the lesion as a giant pilomatrixoma. These pilomatrixoma pose a diagnostic challenge as they mimic malignant lesions. It was highly erythematous and mimicked Merkel cell carcinoma in on initial presentation. It was a sebum-filled lesion, which is quite atypical for pilomatrixoma. A previous study finds that only three cases of cystic pilomatrixoma have been reported in the literature previously. This case study presents the case of an atypical variant of a rare tumour. There is a paucity in the literature on cystic pilomatrixoma. Giant proliferating cystic pilomatrixoma has not previously been described in a case report in the literature, as to our knowledge. This study highlights the diversity in the clinical presentations of pilomatrixoma to improve our clinical sensitivity to pilomatrixoma.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.016 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.006 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.006 | 0.000 |
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 teacher head, 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".