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In this section we have spot diagnoses posted on a daily basis since June 2010, now over 4000! You can review the archived cases and read the suggested diagnoses by users and the final comment by the contributors.
Case are uploaded each week day by 10 am UK time with the correct diagnosis will generally be posted at 8 pm UK time. Why not view the most recent spot diagnosis and proffer a diagnosis?

Case Number : Case 866 - 14th October Posted By: Guest

Please read the clinical history and view the images by clicking on them before you proffer your diagnosis.
Submitted Date :
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The patient is a 36 year old white woman with a punch biopsy taken from the lateral aspect of the right lower leg.

Case posted by Dr. Mark Hurt.
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Go to records October 2013

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Dr. Mona Abdel-Halim

Dr. Mona Abdel-Halim 508

Posted

Papillary intralymphatic angioendothelioma (PILA).

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Guest carlos
Hobnail haemangioma Targetoid hemangiotic haemangioma

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Guest Romualdo

Guest Romualdo

Posted

Hobnail (Dabska-retiform) hemangioendothelioma.

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Sasi Attili

Sasi Attili 85

Posted

[color=#1C2837][font=arial, verdana, tahoma, sans-serif][size=4]Hobnail haemangioma[/size][/font][/color]

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Robledo F. Rocha

Robledo F. Rocha 336

Posted

Hobnail hemangioma / targetoid hemosiderotic hemangioma. Age and site are typical. Also there's no rete testis-like appearance, a feature that would drive to the diagnosis of retiform hemangioendothelioma, and the presence of plump endothelial cells lining intraluminal papillary projections rules out patch Kaposi's sarcoma.

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Dr. Mona Abdel-Halim

Dr. Mona Abdel-Halim 508

Posted

What about the lymphocytic collections adjoining the dilated spaces?

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Guest Romualdo

Guest Romualdo

Posted

I think this is a hobnail hemangioendothelioma, not a hobnail hemangioma (targetoid hemosiderotic hemangioma). I am not able to see hemosiderin. By the other hand there are elongated vascular spaces lined by hobnailed cells with large hyperchromatic nuclei. There are no red blood cells within these vascular spaces. Papillary projections and lymphocytes are also seen. So, I agree with Mona: I think this is a hobnail hemangioendothelioma, a term that encompasses retiform hemangioendothelioma and papillary intralymphatic angioendothelioma (PILA).

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Guest Jim Davie MD

Guest Jim Davie MD

Posted

[font=arial,helvetica,sans-serif][size=4]Retiform hemangioendothelioma, with differential only slightly less favouring hobnail hemangioma (targetoid hemosiderotic hemangioma).

Histology and clinical history is equivocal for these two, in my opinion.
Proliferation of collapsed spaces with papillary lumenal architecture. Proliferation is predominantly superficial > mid reticular dermis (assuming that there is no extension into the subcutis; not shown). Extravasated red cells, sparse patchy lymphocytic inflammatory response, no epidermal pseudocarcinomatous changes. No significant hemosiderin (common).[/size][/font]

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