Malignant disease conditions 

Pituitary tumors account for approximately 10% of all intracranial tumors. Most are benign pituitary adenomas that arise from the anterior pituitary gland. Clinical manifestations result from local mass effect on surrounding structures, particularly the optic chiasm, or from hypersecretion or hyposecretion of pituitary hormones.

Laryngeal cancer is a malignant tumor arising from the tissues of the larynx and is one of the most common cancers of the head and neck region. It occurs predominantly in men and is strongly associated with tobacco smoking and alcohol consumption.

Rectal cancer is a malignant tumour arising from the rectal mucosa, usually within the distal 15 cm of the large intestine measured from the anal verge. It is one of the most common gastrointestinal malignancies and is frequently grouped with colon cancer under the term colorectal cancer (CRC).

Hypercalcaemia is defined as an elevated serum calcium concentration above the normal range of 2.2–2.6 mmol/L. It is a common metabolic emergency in oncology, occurring in approximately 10–20% of patients with advanced cancers.

Nasopharyngeal cancer is a malignant tumor arising from the epithelial lining of the nasopharynx, the upper part of the pharynx located behind the nasal cavity. Nasopharyngeal carcinoma is the predominant histological tumor type affecting this region.