Renal abscess is a rare complication of pyelonephritis known to be linked to recurrent urinary tract infections, anatomical abnormalities, obstruction, and the immunocompromised. Symptoms can be very nonspecific such as fever, chills, and abdominal or flank pain, which makes it more challenging to diagnose; however, this has been made easier with the help of medical imaging. Persistently spiking fevers despite antibiotics should prompt a review for possible abscess formation. We describe a case of renal abscess in a previously healthy young female with no risk factors who was successfully treated with antibiotics and radiologically guided percutaneous drainage.

Neisseria mucosa is saprophytic human commensal but reported as a causative agent in a couple of urinary tract infections [UTI] in susceptible individuals. In the present case, a young girl with long standing neurological problems presented with bladder outlet obstruction and fever. Her urine culture yielded Neisseria mucosa which was susceptible to broad spectrum penicillins, aminoglycosides, cephalosporins, ciprofloxacin, and azithromycin. She recovered with suitable dosage of amoxicillin clavulanic acid and was discharged. Isolation of N. mucosa here becomes clinically significant as this girl had various ureteric and lower limb weaknesses in past and was symptomatic for UTI with this infection.

Hyperammonemic encephalopathy (HE) can be broadly defined as an alteration in the level of consciousness due to elevated blood ammonia level. While hepatic cirrhosis is the most common cause of HE, non-hepatic causes like drugs, infections, and porto-systemic shunts can also lead to the presentation. In this case, we highlight an unusual occurrence of recurrent non-cirrhotic HE from obstructive urinary tract infection (UTI) with urea-splitting micro-organisms in an elderly male patient. The patient exhibited altered mentation, and elevated ammonia levels with normal hepatic function at presentation. Urine culture revealed Proteus mirabilis resistant to extended spectrum beta-lactamases (ESBL). Successful management of obstructive UTI was achieved through Foley\'s catheterization and intravenous (IV) antibiotics, resulting in the resolution of HE. This outcome further supports the significance of UTI as a potential cause of hyperammonemia. Thus, UTI as one of the non-hepatic causes of hyperammonemia should always be explored among elderly patients presenting with altered mentation.