Other common differential etiologies include rectus sheath hematoma, abdominal wall abscess, lipoma, and urachal
Foetal abdominal cystic lesions generally have their origin in the genitourinary system, such as hydronephrosis, renal dysplasia, ovarian cyst, and urachal
remnants may persist in approximately 32% of adults, (1) and clinically they can present as patent urachus (most common), umbilical-urachal sinus, vesicourachal diverticulum, and urachal
cyst (second most common) depending on which portion of the urachus persists.
adenocarcinoma; primary adenocarcinoma of the bladder accounts for less than 1% of all bladder malignancies, of these 20-39% are of urachal
Three of these patients had benign features on pathology (urachal
remnant, amyloidosis, and inflammation) and the remaining 13 (0.4%) had stage Ta urothelial carcinoma (Table 2).
Subsequently, a contrast-enhanced abdominal and pelvic CT scan was performed, demonstrating a focal fluid collection contiguous with the bladder dome felt to represent a congenital or acquired/post-operative bladder diverticulum or atypical urachal
However causes of delayed separation of cord such as urachal
anomalies, antibiotic administration, prematurity and low birth weight must be excluded.11,12
Our understanding of urachal
cancer (UrC) has evolved since the seminal studies by Begg  in the 1930's following the first report by Hue and Jacquin  in 1863 and earlier works of Cullen in 1916 .
remnants result from incomplete regression of the fetal urachus .
cancer (UrC) is an uncommon neoplasm, representing 0.5-2% of all bladder cancer.
carcinoma is a rare malignant tumor, accounting for fewer than 1% of all primary bladder cancers .
The differential diagnosis of an adrenal pseudocyst essentially includes all the upper abdominal space-occupying lesions, such as splenic, hepatic, and renal cysts, as well as mesenteric or retroperitoneal cysts, urachal
cysts, and solid adrenal tumours [9, 12, 13, 16].