Medical One Liners 451-460

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451. Periampullary carcinoma: Double duct sign

452. Carcinoma head of pancreas: Barium study - Widening of C loop of duodenum.

453. Down's syndrome: Antenatal ultrasound 

• Increased Nuchal Translucency >3mm (between 11.3 to 13.6 weeks gestation)
• Not to be confused with Nuchal fold thickness which is taken between 18 to 22 weeks of gestation
• Absent / Hypoplastic Nasal bone

454. Ostium secundum is the Most common type of ASD, 

• but in Down's syndrome - Ostium Primum.

455. Pancreatits: Investigation

• Acute pancreatits: CECT is best
• Chronic Pancreatitis: ERCP best, shows chain of lakes

456. Vertebral collapse

• Normal IV disc
• Trauma
• Neoplasm
• Adult - Multiple myeloma , Metastasis
• Child - Histiocytosis
• Reduced IV disc - Pott's spine

457. Most commonly PET scan uses 18 FDG

• In myocardial perfusion - PET uses Rubidium 82

458. Bone infarct / Avascular necrosis - Best test is MRI

459. Vaginal epithelium is derived from endoderm of the urogenital sinus.

460. Half life of 18-FDG is 110 mins.

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