Items tagged “cases”

5,336 results found
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Hemangioendothelioma

A hemangioendothelioma is a tumor derived from blood vessels.  Pathology Subtypes Subtypes dependent on location include hemangioendothelioma (MSK) hemangioendothelioma of liver See also epithelioid hemangioendothelioma
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Musculoskeletal hemangioendothelioma

Hemangioendotheliomas, along with hemangiopericytomas and angiosarcomas, are tumors that arise from vascular structures. In the case of hemangioendotheliomas, the cell of origin is the endothelial cell, and they range from benign to frankly malignant lesions. Epidemiology They typically occur ...
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Musculoskeletal hemangiopericytoma

Musculoskeletal hemangiopericytomas are now considered to be a cellular and more aggressive version of solitary fibrous tumors, and the term has largely been abandoned.  Epidemiology These tumors are most frequently seen in middle-aged adults (~ 4th decade). Pathology The name is derived fro...
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Pantothenate kinase-associated neurodegeneration

Pantothenate kinase-associated neurodegeneration (PKAN), historically also known as Hallervorden-Spatz syndrome, is an autosomal recessive disorder causing involuntary spasticity and progressive dementia. It is a subset of neurodegeneration with brain iron accumulation (NBIA). Epidemiology Cla...
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Heerfordt syndrome

Heerfordt syndrome, also known as Heerfordt-Waldenström syndrome or uveoparotid fever, is a variant of sarcoidosis, comprising of: fever parotid enlargement facial palsy ocular involvement (anterior uveitis) Epidemiology The exact prevalence is unknown, as only isolated case reports exist....
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Hemangiopericytoma

Hemangiopericytoma is a term formerly used to describe a continuum of mesenchymal tumors with elevated cellularity found throughout the body in soft tissue and bone. After many years of controversy, hemangiopericytomas have been shown to not only share histological features similar to solitary f...
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Sinusoidal obstruction syndrome

Sinusoidal obstruction syndrome (SOS), previously known as hepatic veno-occlusive disease (VOD), is a condition arising from occlusion of hepatic venules. Clinical presentation right upper quadrant pain painful hepatomegaly ascites abnormal liver function tests Pathology Toxic injury to l...
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Hydrocolpos

Hydrocolpos is characterized by an expanded fluid filled vaginal cavity. When it is associated with distention of the uterine cavity, the term hydrometrocolpos should then be used. It may present in infancy with a lower abdominal mass, or be delayed till menarche. Pathology Etiology imperfora...
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Hydrometrocolpos

Hydrometrocolpos is characterized by an expanded fluid filled vaginal cavity with associated distention of the uterine cavity. It may present in infancy with a lower abdominal mass, or be delayed till menarche. Pathology Etiology imperforate hymen (most common) also involves the upper portion...
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Hyperostosis frontoparietalis

Hyperostosis frontoparietalis is a variant of the more common and more well known hyperostosis frontalis interna. As the name suggests, there is benign overgrowth exclusively of the inner table of the frontal bones and parietal bones. Characteristic features include sparing of the midline and ou...
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Incus

The incus (plural: incudes) is the middle of the three ossicles articulating with the head of the malleus anteromedially, forming the incudomalleolar joint, and the stapes inferomedially, forming the incudostapedial joint. Named parts include: a body which articulates with the head of the mall...
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Interstitial ectopic pregnancy

Interstitial ectopic pregnancy, also known as intramural ectopic pregnancy, is an important type of ectopic pregnancy with higher risks of rupture and hemorrhage compared to usual tubal ectopic pregnancies.  Terminology The term interstitial pregnancy is sometimes interchangeably used with cor...
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Interstitial line sign

The interstitial line sign is an ultrasound finding in interstitial ectopic pregnancy. It is an echogenic line from the mass to the endometrial echo complex. Reportedly it has high sensitivity (80%) and specificity (98%).
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Intraosseous ganglion

An intraosseous ganglion (plural: ganglia) is a benign subchondral radiolucent lesion without degenerative arthritis.  Epidemiology  Tends to occur in middle age. Clinical presentation Patients may have mild localized pain. Pathology They are uni-/multilocular cysts surrounded by a fibrous...
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Kager triangle

Kager triangle is a sharply marginated radiolucent triangle seen posteriorly on lateral radiographs of the ankle. It represents the Kager fat pad, although often the latter term is used as a synonym for Kager triangle, even though they are not strictly the same. It is bordered anteriorly by the...
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Kasabach-Merritt syndrome

Kasabach-Merritt syndrome, also known as hemangioma thrombocytopenia syndrome, is a rare life-threatening disease found in infants in which a rapidly growing vascular tumor is responsible for thrombocytopenia, microangiopathic hemolytic anemia and consumptive coagulopathy. Pathology Vascular t...
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Kerr kink

The Kerr kink is a sign of renal tuberculosis. Scarring in the adjacent tissues due to chronic inflammation leads to a sharp kink at the pelviureteric junction (PUJ). History and etymology William "Bill" K Kerr, a Canadian urologist, described his eponymous sign in 1967 3.
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Kikuchi-Fujimoto disease

Kikuchi-Fujimoto disease, also known as subacute necrotizing lymphadenitis or subacute necrotizing histiocytosis, is an idiopathic disease characterized usually by cervical lymph node enlargement (80%). Epidemiology It typically affects young women. Although it may affect any race, there is hi...
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Kimura disease

Kimura disease, also known as eosinophilic hyperplastic lymphogranuloma, is a rare benign inflammatory disease that characteristically manifests as enlargement of cervical lymph nodes and salivary glands. Epidemiology Kimura disease typically affects males (80%) between 20 and 40 years of age ...
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Large intestine

The large intestine (also known as the large bowel) is a 1.5 meter muscular tube that extends from the cecum to the rectum. It has three outer longitudinal muscular layers called taenia coli, which are about 30 cm shorter than the length of the large bowel causing characteristic sacculations int...