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Sergey V Popov,1– 3 Igor N Orlov,1,4 Daria Yu Chernysheva,1 Sergey M Malevich1 1Urology Department, St. Luke’s Clinical Hospital, Saint-Petersburg, Russia; 2Urology Department, Military Medical Academy Named After S.M. Kirova, Saint-Petersburg, Russia; 3Hospital Surgery Department, Saint-Petersburg State University, Saint-Petersburg, Russia; 4Urology Department, North-Western State Medical University Named After I.I. Mechnikov, Saint-Petersburg, RussiaCorrespondence: Daria Yu ChernyshevaUrology Department, St. Luke’s Clinical Hospital, Chugunnaya Street 46, Saint-Petersburg, 194044, RussiaTel +7921 873 85 60Fax +7812 576 11 55Email Daria.chern@gmail.comAbstract: Cystic formations in the prostate are quite common, but the vast majority are benign. The cystic form of prostate adenocarcinoma can present unexpected symptoms, and management can be difficult because of the local advanced stage of the disease. A unique feature of this case is the surgical local cancer treatment. In this clinical case, we describe the literature surrounding this rare form of neoplasm. We present a clinical case of a rare form of prostate cancer in a 71-year-old male who was admitted to ER with acute urinary retention. A huge obstructing prostatic cyst was revealed. After successful trial-without-catheter, the patient underwent transperineal cyst draining and this restored urination. PSAt was increased up to 55 ng/mL. The cystic wall biopsy revealed adenocarcinoma with a Gleason score of 8 (4+4) (Gleason Group IV), and distant metastasis was noticed with PSMA PET/CT. The patient started androgen deprivation therapy (ADT) with excellent PSA dynamics in three months. Because of lower urinary tract symptoms, he needed local treatment and underwent radical prostatectomy. A three-month follow-up demonstrated a common post-operative period, mild stress incontinence, and PSAt 0.004 ng/mL. Cystic prostatic carcinoma can manifest as urinary retention and be mistakenly taken for a benign obstructing prostate cyst. Despite the locally advanced tumor, it can be successfully treated locally in highly selected patients.Keywords: prostate cancer, cystic adenocarcinoma, urinary obstruction

The possibilities of the application of waste gypsum (citrogypsum, nitrogyosum and sulphogypsum), fly ash and bottom ash in construction: for production of gypsum binders (a-calcium sulphate hemihydrate, b-calcium sulphata hemihydrate and b-anhydrite), for obtaining construction products (bricks and blocks) and as component materials for road layers were presented in this work. Also, the possibilities of the application of sulphogypsum (or FGD gypsum) for solidification and stabilization of fly ash were presented. The obtained results could have great importance in both ecological and economic views (elimination of important pollutants of water, air and soil, replacement of natural by waste materials, reduction of waste disposal cost).