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Prostatic adenocarcinoma with atrophic features: malignancy mimicking a benign process
A J Egan1, A Lopez-Beltran, D G Bostwick
1Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota 55905, USA.
The American Journal of Surgical Pathology
|August 1, 1997
Summary
Prostatic adenocarcinoma with atrophic features mimics benign atrophy, potentially leading to underdiagnosis of cancer. Recognizing specific architectural and cytologic findings is crucial for accurate diagnosis in prostate biopsies and resections.
Area of Science:
- Uropathology
- Surgical Pathology
- Oncology
Background:
- Prostate adenocarcinoma can present with features mimicking benign conditions like acinar atrophy and postatrophic hyperplasia.
- This diagnostic challenge can lead to underdiagnosis of malignancy.
- The converse scenario, where benign conditions mimic cancer, is also a known diagnostic dilemma.
Purpose of the Study:
- To investigate the frequency of prostatic adenocarcinoma exhibiting atrophic features.
- To identify the key histopathologic criteria for distinguishing atrophic adenocarcinoma from benign processes.
- To assess the diagnostic implications of this entity in radical prostatectomy specimens and needle biopsies.
Main Methods:
- Retrospective review of 202 whole-mount radical prostatectomy specimens and 100 routine needle biopsy specimens with adenocarcinoma.
- Inclusion of five additional selected needle biopsy specimens.
- Histopathologic analysis focused on architectural mimicry of atrophy and cytologic features of malignancy, excluding cases with prior androgen deprivation therapy.
Main Results:
- Prostatic adenocarcinoma with atrophic features was identified in 3% of radical prostatectomy specimens and 2% of needle biopsies.
- Atrophic features constituted a significant proportion of the tumor (mean 27% in prostatectomy, 24% in biopsies).
- Associated features included proteinaceous secretions, mucin, crystalloids, apocrine blebs, collagenous micronodules, and high-grade prostatic intraepithelial neoplasia.
Conclusions:
- Prostatic adenocarcinoma with atrophic features is an uncommon entity that can be mistaken for benign acinar atrophy.
- Accurate diagnosis relies on a combination of architectural and cytologic findings, differentiating it from benign conditions.
- This pattern typically coexists with conventional Gleason score 5-7 adenocarcinoma and recognition is vital to prevent underdiagnosis.