Histiocytoid Sweet's Syndrome in the Setting of Myelodysplastic Syndrome.

Acute febrile neutrophilic dermatosis, or Sweet's syndrome, is characterized by tender, edematous papules and plaques, favoring the upper extremities and the head and neck regions. The classic variant of Sweet's syndrome involves a predominantly neutrophilic dermal infiltrate on histopathology. However, histiocytoid Sweet's syndrome has been noted to have a primary histiocytoid mononuclear infiltrate and is typically found in patients with malignancies such as myelodysplasia. This case report discusses the treatment of histiocytoid Sweet's syndrome in an immunocompromised patient with a recent history of Mycobacterium avium complex infection and latent tuberculosis in the setting of myelodysplastic syndrome.

Granuloma Annulare Mimicking Squamous Cell Carcinoma.

Misdiagnosing granuloma annulare (GA) for a malignant process can lead to unnecessary and costly treatment avenues for the patient. Thus, it is salient for surgeons to independently evaluate a patient's clinical and histopathologic presentation before proceeding with surgery. We present a case of a 67-year-old male with a biopsy-proven squamous cell carcinoma (SCC) on the dorsal hand who presented for Mohs micrographic surgery (MMS). At this time, the surgeon noticed the histopathologic diagnosis did not match the patient's clinical appearance. GA was diagnosed following a repeat biopsy of the lesion, which prevented an unnecessary Mohs procedure. We present this case primarily to highlight the importance of clinicopathologic correlation by the surgeon when a patient is referred for surgery.

Paraneoplastic Erythema Annulare Centrifugum Eruption (PEACE) Associated With Metastatic Colorectal Adenocarcinoma.

Erythema annulare centrifugum (EAC) is a figurate erythema presenting with annular, erythematous plaques with a trailing scale. It is considered a hypersensitivity reaction to a variety of antigens and is associated with multiple underlying causes including malignancy. Malignancy-associated EAC is termed paraneoplastic erythema annulare centrifugum eruption (PEACE). Although a specific etiology has yet to be elucidated, this form of EAC is likely to occur due to cytokine and/or antigen stimulation from an underlying malignancy. PEACE is primarily associated with lymphoproliferative disorders and rarely solid tumors. Our report discusses a case of PEACE associated with metastatic colorectal adenocarcinoma. On presentation to our clinic, the patient had developed a migratory annular eruption over a year. His review of symptoms was positive for signs of underlying malignancy, including weight loss and recent lower vertebral fracture. A biopsy of his annular lesion revealed a non-specific pityriasiform dermatitis. A vertebral biopsy uncovered a diagnosis of metastatic colorectal cancer. At that time, clinicopathologic correlation allowed us to reach the diagnosis of PEACE.