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A 4-year history of headache and severe neck pain led to a diagnosis of Chiari I malformation in this patient. Here: symptoms, diagnostic tests, and treatment approaches.

Chiari I Malformation in a Young Man With Persistent Neck Pain

A 76-year-old woman seeks your attention for an asymptomatic “red spot” on her neck. She has a history of multiple non-melanoma skin cancers.

Squamous cell carcinoma in situ (Bowen  disease)

Lichenoid keratosis (an inflammatory variant of seborrheic keratosis)

A 76-year-old woman seeks your attention for an asymptomatic “red spot” on her neck. What does this look like to you?

Clinical Topics

What's This "Red Spot"?


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 66-year-old woman had a mildly pruritic rash on the buttocks, lower back, abdomen, and upper posterior thighs. The eruption had been present for approximately 18 months.

A 66-year-old woman had a mildly pruritic rash on the buttocks, lower back, abdomen, and upper posterior thighs. The eruption had been present for approximately 18 months. Your diagnosis?

“Swimsuit Area” Rash: Your Dx?

No labs, no biopsies . . .  you can make this Doorway Diagnosis just by looking.

Pictured is the posterior right knee of a 69-year-old woman showing a rounded protuberance at the popliteal fossa.

No labs, no biopsies, no imaging -- only your seasoned clinical judgement is required to make a diagnosis in this case. 

Bulge Behind the Knee 

A 67-year-old woman seen in clinic for unrelated concerns is incidentally noted to have a “rash” on her flank. She says it appeared in adulthood and has been stable for some years. On the right lower back, there is an asymptomatic reticulated erythema without scale or ulceration

. The patient admits to regular heating pad use on her lower back for pain. The remainder of the skin examination is within normal limits.

The patient says the incidental finding appeared in adulthood and has been stable for years. Can you identify this reticulated erythema?

An Asymptomatic Rash on the Low Back of an Older Woman 

A 47-year-old man presents c/o swelling in extremities-hands x1 week; legs, x1 month. Marked tumescence is seen in the hands and pitting edema is noted on lower legs. PMH: HTN, T2DM, hyperlipidemia; S/P cholecystectomy. Meds: HCTZ; lisinopril; amlodipine; insulin. See differential diagnosis below.

VIDEO: Note marked tumescence in patient’s hands, pitting edema in lower extremities. Does PMH contribute? Dx?

A 47-year-old Man with Peripheral Edema 

Jason J. Song, MD, PhD

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