[Main Types of Cysts in Dermatopathology: Part 2]. / Principales tipos de quistes en dermatopatología: Parte 2.

This is the second article in a two-part series published in this journal, in which we examine the histopathological characteristics, as well as the differential diagnosis, of the main entities that present as cystic and pseudocystic structures in cutaneous biopsy. In this second article, we address ciliated cutaneous cysts, branchial cysts, Bartholin's cysts, omphalomesenteric cysts, thymic cysts, thyroglossal duct cysts, synovial cysts, and median raphe cysts, as well as mucocele, ganglion, and auricular and digital myxoid pseudocysts.

[Main Types of Cysts in Dermatopathology: Part 1]. / Principales tipos de quistes en dermatopatología: parte 1.

Cystic structures represent one of the most common findings in dermatopathology. These encompass both cystic tumors and pseudocysts resulting from the accumulation of certain substances, such as mucin. In a two-part series (of which this is the first part), we have reviewed the principal types of cysts and pseudocysts that may be observed in cutaneous biopsies, examining their histopathological features and primary differential diagnoses. This first part encompasses infundibular cysts, eruptive dermoid cysts, pigmented follicular cysts, pilonidal cysts, tricholemmal cysts, milium cysts, hybrid cysts, bronchogenic cysts, as well as steatocystoma, hydrocystoma, and comedones.

Post-Transplant Lymphoproliferative Disorder, Monomorphic Type, in a Kidney Transplant Patient After Administration of Anti-Influenza Vaccine.

ABSTRACT: Post-transplant lymphoproliferative disorders (PTLD) are rare complications in solid organ transplant patients. Their pathogenesis is largely unknown and closely linked to low immunity, which allows uncontrolled lymphocyte proliferation. Although transplant patients receive annual influenza vaccination as a preventive protocol, we have not found any cases where the flu vaccine triggered a PTLD. We present the case of a 49-year-old female kidney transplant recipient who developed an Epstein-Barr virus-negative PTLD, CD30 + anaplastic monomorphic type, ALK-, which presented the day after a single dose of anti-influenza vaccine. The initial clinical presentation was subcutaneous, but imaging studies revealed multiorgan involvement.

Axillary Cutaneous Hemosiderosis in a Patient With Hyperhidrosis, After Intravenous Iron Infusion.

ABSTRACT: Hemosiderosis consists of an iron deposit in tissues, which does not cause organic damage to them. However, in the case of the skin, being an organ exposed to sight, siderosis can produce a brownish coloration that is aesthetically discomforting for the individual. Most cutaneous sideroses are because of venous insufficiency with hemorrhagic extravasation. There is also a group secondary to iron extravasation in the injection site of the transfusion. However, there are very few cases in which an intravenous injection of an iron preparation has produced diffuse siderosis in extensive areas of the skin. We present the case of a 31-year-old woman with hyperhidrosis, who was transfused as a result of postpartum hemorrhage and, shortly after receiving an intravenous iron infusion, developed extensive hyperpigmentation in both axillae.