Sinonasal blue nevus: a case report and review

Blue nevus is a type of uncommon benign pigmented lesion in the skin or the mucosa of human body which is featured by pigmented dendritic melanocytes and spindled melanocytic cells. Sinonasal blue nevus is extremely rare. We reported a sinonasal blue nevus case with the background of pituitary adenoma, type 2 diabetes mellitus, and hypertension (including endoscopic and histological pictures). Further, the existing literature about blue nevus is reviewed. This paper puts a spotlight on the potential correlation between blue nevus with the endocrine system disorder and provides support for further experimental research.

A Case of Blue Nevus Mimicking Malignant Melanoma Within a Keloid Scar

Blue nevus is a type of melanocytic nevus which clinically presents itself as blue/gray plaque or nodule. It most commonly develops upon distal extremities especially dorsal hands and feet, trunk and scalp. Histopathologically, heavy melanocyte aggregations in the deep dermis result in blue nevus formation. Different types of blue nevus include common blue nevus, cellular blue nevus, plaque-type blue nevus, combined blue nevus, desmoplastic blue nevus and subungal blue nevus. Although clinical findings may be sufficient to diagnose blue nevus, dermoscopy could be used as a helpful tool to aid in reaching the correct diagnosis. Dermoscopy usually shows diffuse blue-gray structureless area but since atypical clinical and dermoscopical features may be observed, histopathological diagnosis is the definitive step to differentiate blue nevus from its mimickers such as malignant melanoma. We want to present an interesting case of blue nevus mimicking malignant melanoma developing in a scar.

Evolving eponymous signs in diagnostic dermoscopy

Dermoscopy is a very useful technique devised for an earlier diagnosis of skin melanoma with a clinic-pathological correlation. Later it was found to be beneficial for the diagnosis of many other pigmented skin lesions, such as seborrheic keratosis, pigmented basal cell carcinoma, hemangioma, blue nevus, atypical nevus, and mole, which can often clinically simulate melanoma. Of late, its use in general clinical dermatology is growing with the recognition of new and specific patterns in conditions such as hair disorders, inflammatory disorders, and infections/infestation. It is still in the evolving phase and many new signs are described presently. Eponyms are used almost daily in dermatology practice. The eponyms in dermoscopy, trichoscopy, and onychoscopy are based on the imaginative capability of the authors and they have been very much successful in describing them. It becomes easier to memorize and identify the various appearances for early diagnosis and management. In this article we attempt to highlight the various dermoscopic signs described in dermatology.