Neuromyelitis optica is a rare autoimmune disorder that primarily affects the optic nerves and spinal cord. It causes inflammation that can lead to vision loss, weakness, paralysis, and sensory disturbances. Neuromyelitis optica was once considered a form of multiple sclerosis but is now recognized as a distinct condition with different underlying mechanisms. The disease may occur as a single episode …

A deviated septum is a condition in which the nasal septum, the wall of cartilage and bone that divides the nasal cavity into two nostrils, is displaced to one side. This can reduce airflow through one or both nostrils and may interfere with normal breathing. A deviated septum can be present from birth or result from injury to the nose. …

Retinal detachment is a serious eye condition in which the retina, the light-sensitive layer at the back of the eye, separates from the underlying supportive tissue. This separation prevents the retina from functioning properly, leading to vision loss. Retinal detachment is a medical emergency that requires prompt diagnosis and treatment to prevent permanent blindness. It is more common in older …

Desmoplastic Small Round Cell Tumors are rare, aggressive cancers that usually develop in the abdominal cavity and primarily affect adolescents and young adults. They arise from soft tissues and are characterized by small cancer cells surrounded by dense fibrous tissue. This condition is uncommon and often diagnosed at an advanced stage due to nonspecific early symptoms. Symptoms Symptoms depend on …

Desmoid tumors, also known as aggressive fibromatosis, are rare, noncancerous growths that arise from connective tissue, particularly fibrous tissue in muscles, tendons, or ligaments. Although they do not spread to distant organs, desmoid tumors can grow aggressively into surrounding tissues and cause significant local damage. They can occur anywhere in the body and may recur after treatment. Symptoms Symptoms depend …

Dermatomyositis is a rare inflammatory disease characterized by muscle weakness and a distinctive skin rash. It is an autoimmune condition in which the immune system mistakenly attacks muscle fibers and skin tissue. Dermatomyositis can affect both adults and children and may develop gradually or suddenly. Early diagnosis and treatment are important to prevent long-term muscle damage and disability. Symptoms Symptoms …

Dermatographia, also known as dermatographism, is a common form of physical urticaria in which minor scratching or pressure on the skin causes raised, red lines or welts. The term means “skin writing,” as markings appear shortly after the skin is stroked. It is generally harmless and not contagious, though symptoms can be uncomfortable and recurrent. Symptoms Symptoms usually appear within …

Dermatofibrosarcoma Protuberans is a rare, slow-growing soft tissue cancer that originates in the deep layers of the skin, particularly the dermis and subcutaneous tissue. It typically presents as a firm skin lesion that gradually enlarges over time. Although it grows slowly and rarely spreads to distant organs, it has a high tendency to recur locally if not treated adequately. Symptoms …

Seborrheic dermatitis is a common, chronic skin condition that causes red, inflamed skin with greasy or flaky scales. It most often affects areas of the body rich in oil-producing glands, such as the scalp, face, sides of the nose, eyebrows, ears, chest, and upper back. On the scalp, it is commonly known as dandruff. The condition tends to wax and …

Teen depression is a serious mental health condition that affects how adolescents think, feel, and behave. It goes beyond normal mood changes associated with growing up and can interfere with school performance, relationships, and daily activities. Teen depression is common and treatable, but it often goes unrecognized because its symptoms may be mistaken for typical teenage behavior. Early identification and …