Zinner syndrome is a rare embryological development disorder. It is the association of a cystic dilation of the seminal vesicle with ipsilateral renal agenesis.
The case is presented as a 14-year-old male diagnosed with Zinner syndrome as a consequence of an orchiepididymitis and hematuria episode. Among his medical history, a left renal agenesis is highlighted with preserved renal function. Due to the clinical suspicion, a MRI was performed in which it was observed a dilated and tortuous left ureter, being able to confirm its opening in the left seminal vesicle.
Zinner syndrome is clinically presented with recurrent epididymitis episodes, voiding disorders or ejaculatory alterations, being able to appear at any age, although the most common is during the second and third decade of life.
MRI is the diagnostic method of choice. Treatment relies on the clinic. Surgery is usually reserved for symptomatic patients or for those cysts that are detected at an early age, in order to avoid possible complications.

We present the case of a seven-year-old boy with gastroenteritis caused by Salmonella D9. Fifteen days after the clinical onset, he began to develop muscular pain, unsteady gait, testicular pain and skin lesions. The diagnoses were acute cerebellar ataxia, epididymo-orchitis and erythema nodosum. Each of these complications has been reported in the literature, but it is highly unusual to find all of them in the same patient.