Unusual case of a gigantic bladder mimicking a large pelvic cystic mass

Pelvic masses are more common in females compared to the males. Bladder distension secondary to urinary retention can also mimic as a pelvic mass. However, it is rare to see chronic urinary retention with no clinical urinary symptoms. We present a case report of an elderly male who presented with abdominal pain and progressive worsening of breathing, along with abdominal distension. Initially, patient was thought to have a large cystic pelvic mass, causing bilateral renal hydronephrosis due to the ureteric compression. However, urinary cauterization drained 19,000 ml of the urine leading to not only resolution of the symptoms but also clinical improvement of the patient.

Mohammad Khadeem Rumjaun and Sana Amjed have contributed equally to this study and should be considered as co-first authors.

SUMMARY
Generally, pelvic masses are a lot more common in the female population as compared to the males. However, most common pelvic masses in males are usually cancers of the bowel, bladder, and prostate. Distended bladder secondary to urinary retention may also mimic a pelvic mass. This is the first case recorded locally where an enlarged prostate led to a chronic obstruction leaving up to 19,000 ml of urinary retention.

CASE PRESENTATION
We present a case of a 79-year-old male, who presented to the hospital with abdominal distension and pain, progressive worsening of shortness of breathing and inability to sleep for the past few weeks. Surprisingly, no urinary symptoms were reported by the patient. On examination, a large right hypochondrial mass extending to the hypogastrium was palpated along with generalized tenderness, but no features suggestive of peritonism were noted. Chest examination was clear with equal air entry at the bases bilaterally. An emergency CT scan of the abdomen and pelvis was requested to rule out any underlying malignancy which revealed a massive homogeneous cystic mass (measuring approximately 38*17*25 cm) in the right-side-abdomen extending from pelvis to compress the liver and cause raised right hemidiaphragm. (Figures 1 and 2) Overall appearance of this cyst was non-aggressive, but the origin was very difficult to determine partly because of the size. However, it was causing bilateral hydronephrosis, presumably from lower ureteric compression. The renal cortex enhanced normally. (Figure 3) The case was further discussed in the Radiology-Colorectal MDT, and it was suggested by the Radiologist that this cystic lesion might be a significantly distended bladder and advised for urinary catheterization to see if this cystic lesion gets decompressed. Otherwise, they also recommended interventional drainage of this humongous cystic lesion.
After catheterisation, 19,000 ml was drained in nearly 72 h resulting in significant improvement in patient's clinical condition. Thereafter, a repeat CT scan was conducted which demonstrated the complete resolution of the gigantic cystic mass and hydronephrosis. (Figure 4)

Treatment and follow up
The Urology team reviewed the patient in the outpatient clinic, and it was decided that patient will remain on long-term urinary catheter and was commenced on tamsulosin and finasteride. As part of his follow up plan, a trial without catheter was advised by the urologist to avoid any surgical intervention. Despite of multiple attempts, trial without catheter was failed in the community and patient was put on lifelong catheter to avoid similar episode of urinary retention in the future.

DISCUSSION
Urinary retention is a common presentation in the elderly population, especially amongst males. In general, within the next five years, 10% of males in their 70 s and 30% in their eighties will have urinary retention. The most known causes are Benign Prostatic Hyperplasia(BPH), bladder outlet obstruction such as urethral stricture, urinary calculus, neurogenic bladder, haematuria/clot retention, prostate and bladder neoplasm, and constipation. 1 BPH accounts for at least 65% of the urinary retention in males and often preceded by lower urinary tract infection symptoms. 2 Another point worth mentioning is that chronic urinary retention (CUR) is defined by the International Continence Society as 'a non-painful bladder, which remains palpable or percussable even after the patient has passed urine. 3 The interesting aspect of our case is the patient did not report any suprapubic pain, as you would expect in acute urinary retention, nor any other lower urinary tract symptoms until he presented with one of the largest bladders recorded on CT imaging in the world. Patient had