Postradiation prostatic carcinoma
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Postradiation prostatic carcinoma, also prostate carcinoma after radiation therapy, is uncommon but may be challenging to diagnose.[1]
| Postradiation prostatic carcinoma | |
|---|---|
| Diagnosis in short | |
 Prostatic carcinoma (pale glands - left/bottom of image) and radiation changes (hyperchromatic glands with nuclear atypia (upper right of image). H&E stain. | |
|
| |
| LM | infiltrative growth, perineural invasion, blue mucin secretions, intraluminal crystalloids |
| LM DDx | radiation changes, pleomorphic tumours, postradiation prostatic sarcoma, sarcomatoid prostatic carcinoma |
| IHC | AMACR +ve, CK5/6 -ve, p63 -ve, PSA +ve |
| Site | prostate gland |
|
| |
| Clinical history | radiation treatment, prostate carcinoma (previously diagnosed) |
| Prevalence | uncommon |
| Blood work | elevated PSA or increasing PSA |
| Prognosis | poor (?) |
| Clin. DDx | radiation changes, infection |
| Treatment | salvage prostatectomy |
General
- Overcall and undercall are both seen.[1]
- Commonly missed on core biopsies.
- History of radiation.
Microscopic
Features:[1]
- Infiltrative growth (diagnostic).
- Perineural invasion (diagnostic).
- Intraluminal crystalloids.
- Blue mucin secretions.
- Absence of corpora amylacea.
- Coexistent high-grade prostatic intraepithelial neoplasia.
Note:
- Nuclear enlargement and prominent nucleoli are prevalent in radiation changes of the prostate. These features are not useful in this context.[1]
DDx:
- Radiation changes.
- Pleomorphic tumours.
- Postradiation prostatic sarcoma.[2]
- Sarcomatoid prostatic carcinoma - may arise following radiation.
Images
PC and RC - intermed. mag.
PC and RC - intermed. mag.
PC and RC - high mag.
PC and RC - very high mag.
RC - high mag.
RC - very high mag.
IHC
- AMACR +ve.
- CK5/6 -ve.
- p63 -ve.
Images
PC and RC (AMACR-CK5/6) - low mag.
PC and RC (AMACR-CK5/6) - intermed. mag.
PC and RC (AMACR-CK5/6) - high mag.
See also
References
- ↑ 1.0 1.1 1.2 1.3 Cheng, L.; Cheville, JC.; Bostwick, DG. (Oct 1999). "Diagnosis of prostate cancer in needle biopsies after radiation therapy.". Am J Surg Pathol 23 (10): 1173-83. PMID 10524518.
- ↑ Canfield, SE.; Gans, TH.; Unger, P.; Hall, SJ. (Dec 2001). "Postradiation prostatic sarcoma: de novo carcinogenesis or dedifferentiation of prostatic adenocarcinoma?". Tech Urol 7 (4): 294-5. PMID 11763492.