[Durgical](https://durgical.com/en/) › [DurgiPedia](https://durgical.com/en/durgipedia/) › [General pathology](https://durgical.com/en/general-pathology/) › [A to Z](https://durgical.com/en/general-pathology/a-z/) › O # General pathology: O 38 pages - [**Obesity: leptin, adipokines and its consequences** Nutritional pathology · Mechanism](https://durgical.com/en/general-pathology/obesity-leptin-adipokines-and-its-consequences/) - [**Obstructive congenital heart lesions** Heart · Lesion](https://durgical.com/en/general-pathology/obstructive-congenital-heart-lesions/) - [**Obstructive vs restrictive lung disease: the comparison table** Lung · Topic](https://durgical.com/en/general-pathology/obstructive-vs-restrictive-lung-disease-the-comparison-table/) - [**Odontogenic cysts and tumours** Head and neck · Lesion](https://durgical.com/en/general-pathology/odontogenic-cysts-and-tumours/) - [**Oesophageal adenocarcinoma: from Barrett to invasive cancer** Gastrointestinal tract · Lesion](https://durgical.com/en/general-pathology/oesophageal-adenocarcinoma-from-barrett-to-invasive-cancer/) - [**Oesophageal lacerations: Mallory–Weiss tear and Boerhaave rupture** Gastrointestinal tract · Lesion](https://durgical.com/en/general-pathology/oesophageal-lacerations-mallory-weiss-tear-and-boerhaave-rupture/) - [**Oesophageal obstruction: stenosis, webs, rings, diverticula** Gastrointestinal tract · Lesion](https://durgical.com/en/general-pathology/oesophageal-obstruction-stenosis-webs-rings-diverticula/) - [**Oesophageal squamous cell carcinoma** Gastrointestinal tract · Lesion](https://durgical.com/en/general-pathology/oesophageal-squamous-cell-carcinoma/) - [**Oesophageal varices: portosystemic collaterals and why they bleed** Gastrointestinal tract · Lesion](https://durgical.com/en/general-pathology/oesophageal-varices-portosystemic-collaterals-and-why-they-bleed/) - [**Oncogenes: RAS, MYC, HER2, BCR-ABL and the table to know** Neoplasia · Topic](https://durgical.com/en/general-pathology/oncogenes-ras-myc-her2-bcr-abl-and-the-table-to-know/) - [**Oncogenic viruses and H. pylori: the table to know** Neoplasia · Topic](https://durgical.com/en/general-pathology/oncogenic-viruses-and-h-pylori-the-table-to-know/) - [**Optic neuropathies** Eye · Lesion](https://durgical.com/en/general-pathology/optic-neuropathies/) - [**Oral infections and the mouth in systemic disease** Head and neck · Lesion](https://durgical.com/en/general-pathology/oral-infections-and-the-mouth-in-systemic-disease/) - [**Orbital disease** Eye · Lesion](https://durgical.com/en/general-pathology/orbital-disease/) - [**Osteoarthritis** Bones, joints and soft tissue · Lesion](https://durgical.com/en/general-pathology/osteoarthritis/) - [**Osteogenesis imperfecta: the type I collagen disease** Bones, joints and soft tissue · Lesion](https://durgical.com/en/general-pathology/osteogenesis-imperfecta-the-type-i-collagen-disease/) - [**Osteoid osteoma and osteoblastoma** Bones, joints and soft tissue · Lesion](https://durgical.com/en/general-pathology/osteoid-osteoma-and-osteoblastoma/) - [**Osteomyelitis: pyogenic, tuberculous and syphilitic** Bones, joints and soft tissue · Lesion](https://durgical.com/en/general-pathology/osteomyelitis-pyogenic-tuberculous-and-syphilitic/) - [**Osteonecrosis (avascular necrosis)** Bones, joints and soft tissue · Lesion](https://durgical.com/en/general-pathology/osteonecrosis/) - [**Osteopetrosis and storage disease of bone** Bones, joints and soft tissue · Lesion](https://durgical.com/en/general-pathology/osteopetrosis-and-storage-disease-of-bone/) - [**Osteoporosis** Bones, joints and soft tissue · Lesion](https://durgical.com/en/general-pathology/osteoporosis/) - [**Osteosarcoma** Bones, joints and soft tissue · Lesion](https://durgical.com/en/general-pathology/osteosarcoma/) - [**Other bladder tumours** Lower urinary tract and male genital system · Lesion](https://durgical.com/en/general-pathology/other-bladder-tumours/) - [**Other colitis: microscopic, diversion, GVHD, drug** Gastrointestinal tract · Lesion](https://durgical.com/en/general-pathology/other-colitis-microscopic-diversion-gvhd-drug/) - [**Other demyelinating diseases** Central nervous system · Lesion](https://durgical.com/en/general-pathology/other-demyelinating-diseases/) - [**Other enteropathies** Gastrointestinal tract · Lesion](https://durgical.com/en/general-pathology/other-enteropathies/) - [**Other forms of cell death: necroptosis, pyroptosis, ferroptosis** Cell injury, adaptation and death · Mechanism](https://durgical.com/en/general-pathology/other-forms-of-cell-death-necroptosis-pyroptosis-ferroptosis/) - [**Other lesions of the spleen** White cells, lymph nodes, spleen and thymus · Lesion](https://durgical.com/en/general-pathology/other-lesions-of-the-spleen/) - [**Other lung tumours and lung metastases** Lung · Lesion](https://durgical.com/en/general-pathology/other-lung-tumours-and-lung-metastases/) - [**Other marrow failure: PRCA and myelophthisis** Red cells and bleeding disorders · Lesion](https://durgical.com/en/general-pathology/other-marrow-failure-prca-and-myelophthisis/) - [**Other renal cysts: medullary, dysplastic, acquired** Kidney · Lesion](https://durgical.com/en/general-pathology/other-renal-cysts-medullary-dysplastic-acquired/) - [**Other retinal vascular disease: ROP and occlusions** Eye · Lesion](https://durgical.com/en/general-pathology/other-retinal-vascular-disease-rop-and-occlusions/) - [**Other sex cord–stromal tumours** Female genital tract · Lesion](https://durgical.com/en/general-pathology/other-sex-cord-stromal-tumours/) - [**Other thyroiditis: de Quervain, painless, Riedel** Endocrine system · Lesion](https://durgical.com/en/general-pathology/other-thyroiditis-de-quervain-painless-riedel/) - [**Outcomes of acute inflammation: resolution, abscess, scar or chronic inflammation** Inflammation · Topic](https://durgical.com/en/general-pathology/outcomes-of-acute-inflammation-resolution-abscess-scar-or-chronic-inflammation/) - [**Ovarian teratomas** Female genital tract · Lesion](https://durgical.com/en/general-pathology/ovarian-teratomas/) - [**Ovarian tumours: classification** Female genital tract · Topic](https://durgical.com/en/general-pathology/ovarian-tumours-classification/) - [**Oxidative stress and free-radical injury** Cell injury, adaptation and death · Mechanism](https://durgical.com/en/general-pathology/oxidative-stress-and-free-radical-injury/) ## A to Z - 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[U](https://durgical.com/en/general-pathology/a-z/u/) - [V](https://durgical.com/en/general-pathology/a-z/v/) - [W](https://durgical.com/en/general-pathology/a-z/w/) [← General pathology](https://durgical.com/en/general-pathology/) Representative model, for educational purposes only. --- Source: https://durgical.com/en/general-pathology/a-z/o/