The mysterious sebaceous horn (devil's horn) is a historically perplexing phenomenon of unknown etiology. It classically occurs on the sun-exposed areas of the face and hands and consists of a keratin mound with a benign base in most cases and squamous cell carcinoma occurring in about 20% of patients.
The study investigates the role of Demodex mites in the development of eyelid papillomas, focusing on how their presence may influence the tumor's histomorphological characteristics.
Histomorphological examinations revealed demodectic infection indicators, such as cystic formations and remnants of the mite, in nearly half of the analyzed cases, found within tumor tissues and surrounding structures.
The findings suggest that these cavity defects created by mite activity may serve as indicators of Demodex infestation, with implications for understanding their impact on various eyelid tumors, including keratoacanthomas and senile keratosis.
Poroid neoplasms (PN) are diverse tumors that originate from sweat glands, and their classification and identifying features can be difficult.
A study conducted at the Niamey National Hospital from February 2020 to February 2024 found 13 cases of benign poroid neoplasms, mostly classic poromas, with a majority being misdiagnosed as malignant before surgery.
The results indicate that these tumors often have apocrine ductal features and tend to occur in younger patients and non-palmoplantar areas, challenging traditional understandings of their characteristics.
A cutaneous horn, or cornu cutaneum, is a growth made of keratinizing skin cells that often develops over underlying skin lesions such as benign and malignant tumors, infections, or other skin conditions.
The text describes two cases: a 22-year-old woman with a cutaneous horn linked to a stubborn wart on her toe, and a 57-year-old man with a horn associated with inverted follicular keratosis on his lip.
The most common conditions related to cutaneous horns are actinic keratosis, squamous cell carcinoma, and seborrheic keratosis, with several benign and malignant tumors associated with these skin growths.
Background: Teratomas are rare types of germ cell neoplasms composed of various differentiated or undifferentiated tissues.
Case Description: A 25-week-old female control FVB /n mouse in a 4-week toxicity study presented abdominal distension and poor body condition. It was euthanized, and the necropsy examination revealed a large mass connected to the tip of the right uterine horn, occupying the entire abdominal cavity.
