Swelling of the Muscles of the Shoulder Girdle in a CT Scan is a Leading Finding for the Diagnosis of Polymyositis.

Polymyositis (PM) is an uncommon inflammatory disease of unknown cause, but the disease shares many characteristics with autoimmune disorders. In the past, the diagnosis criteria for PM depended primarily on clinical features, blood enzyme levels, an electromyogram, and muscle biopsies. However, there are still imperfections in the diagnostic criteria of PM. The development of muscle imaging led to revisiting not only the PM diagnosis strategy but also the patients' follow-up. Teaching point: PM should be considered and included in the differential diagnosis of a patient with inflammatory signs and muscular pain, and the radiologist should be aware of its imaging features.

An Uncommon Location for a Urinary Tract Stone: Urethral Stone.

Teaching point: Attention to the urethra is essential when looking for urinary tract stones or etiology for hematuria.

Radiological Manifestations of Ketamine Abuse.

Teaching point: Awareness of the radiological manifestations helps recognition of ketamine abuse.