60. Narcolepsy Definition A neurologic disorder, narcolepsy is a derangement of the normal sleep-wake cycle characterized by episodes of excessive daytime sleepiness (EDS), cataplexy, hypnagogic and/or hypnopompic hallucinations, and sleep…
58. Mastocytosis Definition Mastocytosis is a clonal disorder in which mast cells and the precursor cells accumulate in different tissues, such as bone marrow, skin, gastrointestinal tract, liver, and spleen….
59. Myasthenia Gravis Definition Myasthenia gravis is an acquired autoimmune disorder of neuromuscular function marked by fatigue and exhaustion of the muscular system. Fluctuations in severity of muscular atrophy accompany…
38. Gardner Syndrome Definition Gardner syndrome is a type of familial adenomatous polyposis that also has extracolonic manifestations, including intestinal polyposis, desmoids, osteomas, and epidermoid cysts. The disorder is inherited…
54. Lymphomatoid Granulomatosis Definition Lymphomatoid granulomatosis (LYG) is a rare angiodestructive, lymphoproliferative disease with significant pulmonary involvement in the form of pulmonary angiitis and granulomatosis. LYG mimics Wegner’s granulomatosis (see…
53. Lymphangioleiomyomatosis Definition Lymphangioleiomyomatosis (LAM) affects women during the childbearing years. It is characterized by proliferation of smooth muscle phenotypic neoplastic cells in the lungs, kidneys, and axial lymphatics. The…
51. Lown-Ganong-Levine Syndrome Definition Lown-Ganong-Levine (LGL) syndrome is a preexcitation syndrome producing supraventricular tachycardia that is neither atrial fibrillation nor atrial flutter. This syndrome is characterized by a short P-R…
52. Ludwig’s Angina Definition Ludwig’s angina is cellulitis of the mouth floor. It expands very rapidly and can spread to other areas of the body, such as the mediastinum or…
50. Long QT Syndrome Definition Long QT syndrome (LQTS) is prolonged duration of the QT interval in the cardiac cycle. This syndrome can be congenital or acquired. The congenital form…
47. Incontinentia Pigmenti Definition Incontinentia pigmenti is a rare, X-linked, dominant inherited disorder involving skin pigmentation. Melanin is lost from the basal cells of the epidermis and collects in the…
