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Double aortic arch-a vascular ring anomaly in which both embryonic aortic arches persist and encircle the trachea and esophagus-is rare.

Double Aortic Arch in an Infant With Persistent Stridor

A 42-year-old man presents with a pruritic rash characterized by pink, scaly plaques with a few crusted erosions on the elbows

knees, lower back, and buttocks. Review of systems was negative, although there was a strong positive family history of celiac disease. He took no medications and was otherwise healthy.

A pruritic, scaly rash appeared on this 42-year-old man's elbows, knees, lower back, and buttocks. Can you ID? 

Clinical Topics

Elbow Erosions 

A 67-year-old woman noted the appearance of several non-tender, rock-hard, purple-colored nodules on her legs. Her medical history was significant for distant non-Hodgkin lymphoma.

A 67-year-old woman noted the appearance of several non-tender, rock-hard, purple-colored nodules on her legs. Her medical history was significant for distant non-Hodgkin lymphoma. The violaceous color and configuration of the skin lesions suggests which of the following? 

Hard Purple Nodules: Your Dx?


These 2 patients presented with a swollen hand and rapidly proximally progressive edema secondary to a bite.

These 2 patients presented with a swollen hand and rapidly proximally progressive edema secondary to a bite. What creature did the biting?

Swollen Hands-What’s Biting?

A morbidly obese man (weight over 400 lb) with multiple medical comorbidities and a long history of extensive psoriasis is hospitalized for the third time for cellulitis of the abdominal wall. The skin of the wall is rock hard, with pebbly nodularity of the surface.

What’s the underlying cause of current cellulitis in this morbidly obese man?

Morbidly Obese Man With Abdominal Wall Cellulitis

This image of the posterior neck of a 26-year-old woman shows a warty type fungating  lesion about the size of a quarter. It had been present since birth. It had been excised and treated with electrodessication several times previously but had always recurred. She had acute and chronic anxiety and would pick at the lesion.

The lesion was elliptically excised under local anesthesia in the office.

This lesion on the posterior neck of a young woman was present since birth and recurred after electrodessication. Can you Dx? 

A Warty, Fungating Lesion 

A 9-year-old boy presented with a 1-week history of pruritus and rash on his elbows, knees, back, and legs. Several areas of excoriation were noted. He had recently run through a field of tall grass but denied any other exposure history.

A 9-year-old boy presented with a 1-week history of pruritus and rash on his elbows, knees, back, and legs. He had recently run through a field of tall grass but denied any other exposure history. Your Dx?

What Cause of This Itchy Rash?

Patricia H. Martin, OMD-III

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