Free gas under the diaphragm - Xray
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Free gas under diaphragm (also known as air under the diaphragm) is a finding in the chest Xray seen in case of perforation of hollow viscus.
When there is perforation, gas within the hollow viscus escapes into the peritoneal cavity along with other contents
When an chest xray is taken in the upright position, gas being …

Lumboperitoneal shunts are channels which facilitate drainage of CSF from the lumbar subarachnoid space to the peritoneal cavity
It can be used in conditions such as Pseudotumor cerebri and hydrocephalus for decreasing the intracranial pressure
The advantage of of lumboperitoneal shunt over ventriculoperitoneal shunt is that there is less incidence of intracranial complications
Some of the disadvantages are risk for scoliosis, sciatica and back pain
There is also the risk of the tube getting blocked and resultant increase in CSF pressure with worsening of clinical status

Cytoreduction literally means reduction in the number of cells
Cytoreduction surgery (also known as debulking surgery / cytoreductive surgery) aims at decreasing the tumor load by removing as much of the tumor as possible
It is resorted to when complete surgical removal of the tumor is not possible
Used along with chemotherapy / radiotherapy for achieving the best possible result
eg: Debulking surgery for gynaecologic malignancy with extensive spread

Tracheal shift to right due to thyroid swelling seen above the level of the clavicle. Tracheal compression can rarely cause stridor in this situation.

Plain X-ray abdomen showing multiple air fluid levels (yellow arrows) in a case of subacute intestinal obstruction.