Articles

Articles are a collaborative effort to provide a single canonical page on all topics relevant to the practice of radiology. As such, articles are written and edited by countless contributing members over a period of time. A global group of dedicated editors oversee accuracy, consulting with expert advisers, and constantly reviewing additions.

8 results found
Article

Oesophageal cancer (staging)

Oesophageal cancer staging can depend slightly on whether the tumour is squamous cell or adenocarcinoma subtype. Due to the lack of a serosal layer, oesophageal cancer often tends to have mediastinal spread at the time of diagnosis. Staging TNM staging T staging Tx: primary tumour cannot be...
Article

Okuda staging system

The Okuda staging system was an advance on earlier hepatocellular (HCC) staging classifications, in that it incorporated both cancer-related variables and liver function related variables to determine prognosis 1: disease involving >50% of hepatic parenchyma ascites albumin ≤3 mg/dL bilirubi...
Article

Olfactory neuroblastoma (staging)

Olfactory neuroblastomas (or esthesioneuroblastomas) are most frequently staged using a system proposed by Kadish et al in 1976 1. group a: tumour is limited to the nasal cavity group b: tumour is limited to the nasal cavity and paranasal sinuses group c: tumour extends beyond the nasal cavit...
Article

Oral cavity tumours (T staging)

T staging of oral cavity tumours is as follows: Oral cavity The anterior border of the oral cavity is the junction of the skin and vermilionborder of the lip. The posterior border is formed by the junction of the hard and soft palates superiorly, the circumvallate papillae inferiorly, and the ...
Article

Oropharyngeal tumours (T staging)

T staging of oropharyngeal tumours is as follows: Definition The oropharynx includes the base of the tongue, the inferior surface of the soft palate and uvula, the anterior and posterior tonsillar pillars, the glossotonsillar sulci, the pharyngeal tonsils, and the lateral and posterior pharyng...
Article

Osteoarthritis of the hip (grading)

Osteoarthritis of the hip can be graded according to severity on imaging. Conventional radiograph grading grade 0: normal grade 1: possible joint space narrowing and subtle osteophytes grade 2: definite joint space narrowing, defined osteophytes and some sclerosis, especially in the acetabul...
Article

Osteochondritis dissecans (surgical staging)

Osteochondritis dissecans can be classified at surgery into 4 stages: stage I stable lesion in continuity with the host bone covered by intact cartilage stage II stable on probing partial discontinuity of the lesion from the host bone stage III unstable on probing fragment not dislocat...
Article

Ovarian cancer (staging)

The most commonly adopted ovarian cancer staging system is the FIGO staging system. The most recent staging system is from 2014 1: CT is considered the best imaging modality for staging ovarian cancer. 4. stage I:  tumour limited to the ovary or fallopian tube stage Ia:  ​tumour limited to o...

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