Publications by authors named "Guilherme Canho Bittner"

Background: The ear is a region that has a high prevalence of cutaneous carcinomas and several guidelines indicate Mohs micrographic surgery as the first-choice treatment in such cases. Although the technique allows maximum preservation of healthy tissue, many auricular surgical wounds constitute a challenge due to the peculiar local anatomy, with evident curves and reliefs. Auricular reconstruction should prioritize function before aesthetics, but without leaving the latter aside, since postoperative distortions can have a significant psychological impact.

View Article and Find Full Text PDF

Mohs micrographic surgery is a specialized form of skin cancer surgery that has the highest cure rates for several cutaneous malignancies. Certain skin cancers can have small extensions or "roots" that may be missed if an excised tumor is serially cross-sectioned in a "bread-loaf" fashion, commonly performed on excision specimens. The method of Mohs micrographic surgery is unique in that the dermatologist (Mohs surgeon) acts as both surgeon and pathologist, from the preoperative considerations until the reconstruction.

View Article and Find Full Text PDF

Background: To evaluate the surgical treatment results of a consecutive series of patients with nonmelanoma skin cancer in critical facial regions such as the nose, lip, eyelid, ear, forehead, cheek, and chin.

Methods: This was a prospective observational cohort study evaluating the surgical treatment results of 102 patients with nonmelanoma skin cancer who underwent surgical excision and required some type of reconstruction. The reconstruction strategy used, histological type and margins, aesthetic result, and complications were evaluated.

View Article and Find Full Text PDF
Article Synopsis
  • Fogo selvagem is an autoimmune skin disease primarily affecting young adults in rural Brazil, characterized by the formation of superficial blisters due to the loss of adhesion in the skin's upper layers.
  • The disease is linked to a mix of genetic, environmental (like insect bites), and immune factors, and can resemble other skin conditions such as seborrheic dermatitis and lupus.
  • Treatment typically involves systemic corticosteroids and other immunosuppressive medications, with many patients achieving stability or remission over time.
View Article and Find Full Text PDF

Harlequin syndrome is a rare condition in which one half of the face fails to flush and sweat due to damage of the sympathetic fibers on the ipsilateral side. The majority of cases are idiopathic, but may be iatrogenic or caused by space-occupying lesions or brainstem infarction. We report a case of idiopathic harlequin syndrome in a 34-year-old man with a 5-month history of unilateral facial flushing and sweating after exercise.

View Article and Find Full Text PDF

Bullous systemic lupus erythematosus (BSLE) is a rare autoimmune subepidermal blistering disease, with few cases described in childhood. It has different clinical-pathological features. We report a case of BSLE in a 10-year-old child with systemic lupus erythematosus, treated with prednisone and hydroxychloroquine.

View Article and Find Full Text PDF

Coatis [including Nasua nasua, the ring-tailed coati], are medium-sized mammals widely distributed in the Americas. They are social animals, whose normal diet includes insects, fruits, and small vertebrates, and rarely prey on larger sized animals. There are, to our knowledge, no reports in the medical literature of attacks on humans.

View Article and Find Full Text PDF