| hydatid thrill | The peculiar trembling or vibratory sensation felt on palpation of a hydatid cyst. Synonym: Blatin's syndrome, hydatid fremitus. (05 Mar 2000) |
|---|---|
| hydatidiform | Having the form or appearance of a hydatid. (05 Mar 2000) |
| hydatidiform mole | <gynaecology, oncology, tumour> A relatively rare mass or tumour that can form within the uterus at the beginning of a pregnancy. The cause of hydatidiform mole is unknown. Symptoms include vaginal bleeding, uterine growth, nausea and vomiting. Some hydatidiform moles may become malignant (cancerous) where they are referred to as a choriocarcinoma. Incidence: 1 in 1,500 births. (02 Jan 1998) |
| hydatidiform mole, invasive | A tumour or tumour-like process invading the myometrium, and characterised by trophoblastic hyperplasia and persistence of placental villous structures. It commonly results from complete hydatidiform mole but may do so from partial hydatidiform mole. Invasive mole may metastasize but it does not exhibit the progression of a true cancer, and it may regress spontaneously. (holland et al., cancer medicine, 3d ed, p1691) (12 Dec 1998) |
| hydatidocele | A cystic mass composed of one or more hydatids formed in the scrotum. Origin: hydatid + G. Kele, tumour (05 Mar 2000) |
| hydatidoma | <tumour> A benign neoplasm in which there is prominent formation of hydatids. Origin: hydatid + G. -oma, tumour (05 Mar 2000) |
| hydatidosis | A tissue infection by the larval stage of the Echinococcus granulosus worm. This disease is common in South America, the Middle East, Asia and Africa. Sporadic cases have been reported in the us. Infection occurs after ingestion of eggs in infected dog faeces. The infection is carried to the liver where cysts form. Cysts may also form in the lungs, bone, brain, kidney, muscles and spleen. Symptoms include abdominal pain, itching, cough, haemoptysis, chest pain and fever. Treatment includes the surgical removal of cysts from the tissue. (27 Sep 1997) |
| hydatidostomy | Surgical evacuation of a hydatid cyst. Origin: hydatid + G. Stoma, mouth (05 Mar 2000) |
| hydatiform mole | <radiology> Trophoblastic proliferation with avascularity of chorionic villi, marked oedema and enlargement of chorionic villi, severe eclampsia prior to 24 weeks, 1st trimester bleeding, abnormal elevation of beta-hCG, passing grapelike vesicles per vagina, uterus large for dates (50%), hyperechoic intrauterine tissue interspersed with numerous punctate hypoechoic areas (hydropic villi), in 25% atypical appearance: large hyperechoic areas (blood clots) and areas of cystic degeneration; resembles incomplete abortion, thick hyperechoic rim around central anechoic zone, bilateral theca lutein cysts (18-37%) see also: gestational trophoblastic disease, hydatiform mole: types (12 Dec 1998) |
| hydatiform mole: types | <radiology> Complete/classical mole, fertilization of an empty egg; diploid karyotype (paternal XX), no foetal parts; no chorionic membrane, 20% malignant complete mole with coexistent foetus (2%), molar degeneration of an identical twin partial mole, areas of molar change alternating with normal chorionic villi, triploid karyotype (66% XXY; 33% XXX), early onset of preeclampsia, foetal structures present (e.g., placenta), no malignant potential see: hydatiform mole (12 Dec 1998) |
| Hydatigera taeniaeformis | One of the common tapeworms of household cats; the larval form is called Cysticercus fasciolaris. Synonym: Hydatigera taeniaeformis, Taenia crassicollis. (05 Mar 2000) |
| hydatoid | <anatomy> Resembling water; watery; aqueous; hyaloid. Origin: Gr. "ydwr, "ydatos, water. Source: Websters Dictionary (01 Mar 1998) |
| Hyde | James N., U.S. Dermatologist, 1840-1910. See: Hyde's disease. (05 Mar 2000) |
| Hyde's disease | An eruption of hard nodules (Picker's nodules) in the skin caused by rubbing and accompanied by intense itching. Synonym: Hyde's disease. (05 Mar 2000) |
| hydnocarpus oil | The fixed oil expressed from seeds of Taraktogenos kurzii and Hydnocarpus wightiana (family Flacourtiaceae); formerly used in the treatment of leprosy. Synonym: gynocardia oil, hydnocarpus oil. (05 Mar 2000) |