(a) (i) Enumerate the causes of radio-opacities on a plain abdominal radiograph. (ii) Enlist the causes of hydronephrosis in…

Causes of Radio-Opacities on Plain Abdominal Radiograph

Radio-opacities observed on a plain abdominal X-ray (KUB/erect) are classified by anatomical system:

• Urinary tract: Nephrolithiasis and ureteric calculi (calcium oxalate, calcium phosphate, struvite), nephrocalcinosis, and bladder calculi.
• Biliary tract: Calcified gallstones (10–15% of all gallstones) and porcelain gallbladder.
• Gastrointestinal: Appendicoliths, enteroliths, swallowed radio-opaque foreign bodies, and ingested heavy medications (e.g., bismuth, iron tablets).
• Vascular: Calcified abdominal aortic aneurysm, splenic artery calcification, atherosclerosis of iliac vessels, and pelvic phleboliths.
• Lymphatic and soft tissue: Calcified mesenteric lymph nodes (post-tubercular), calcified uterine leiomyomas, and calcifications in pelvic dermoid cysts (teeth/bone).

Etiology and Evaluation of Hydronephrosis

Causes in Adults:

• Obstructive:
• Luminal: Ureteric/renal calculi, sloughed papillae, blood clots.
• Mural: Pelvi-ureteric junction (PUJ) obstruction, ureteric strictures (tuberculous, post-radiation, or iatrogenic), and urothelial carcinoma.
• Extramural: Pelvic malignancy (cervical, ovarian, prostate, rectal carcinoma), retroperitoneal fibrosis, retroperitoneal lymphadenopathy, benign prostatic hyperplasia (BPH), and aberrant crossing lower-pole renal vessels.
• Non-obstructive: High-output diuresis, pregnancy (progestational smooth muscle relaxation and mechanical compression), vesicoureteral reflux (VUR), and persistent caliceal dilatation following relief of obstruction.

Investigation of Unilateral Right-Sided Hydronephrosis:

1. Baseline assessment: Urinalysis (microscopy for hematuria, pyuria) and serum renal function tests (BUN, creatinine).
2. Ultrasound (USG) KUB: Initial imaging to confirm hydronephrosis, grade the severity, assess cortical thickness, evaluate the contralateral kidney, and identify proximal calculi or pelvic masses.
3. Non-Contrast Computed Tomography (NCCT) / Contrast-Enhanced CT Urography (CT-IVU): Gold standard anatomical investigation to identify the exact level, extrinsic causes, ureteric path, and vascular relations (such as aberrant crossing vessels in PUJ obstruction).
4. Diuretic Renography (99mTc-EC / MAG3 / DTPA with F+15/F+20 protocol): Assesses split renal function (SRF) and dynamic clearance, objectively differentiating mechanical obstruction from non-obstructive dilatation.
5. Retrograde/Antegrade Pyelography: Reserved for patients with compromised renal function or indeterminate imaging to map the distal extent of the obstruction.

Management of PUJ Obstruction: The primary goal is preservation of renal function and relief of symptoms.

• Surgical Intervention: Indicated for split renal function <40%, progressive functional deterioration (>10% drop on serial renograms), recurrent infection, stone formation, or pain.
• Dismembered Pyeloplasty (Anderson-Hynes technique): Performed via open, laparoscopic, or robotic approaches. It is the gold-standard procedure (>90% success rate), involving excision of the stenotic segment, reduction of the dilated pelvis, and re-anastomosis over a Double-J (DJ) stent.
• Endopyelotomy: Antegrade or retrograde incisional endourological repair; indicated for secondary PUJ strictures or high-risk surgical candidates.
• Nephrectomy: Indicated when the affected kidney is non-functioning (SRF <10–15%) with recurrent pyelonephritis and a normal contralateral kidney.

Biochemical Principles of Dietary Proteins

Essential Amino Acids: Essential amino acids (EAAs) are amino acids that cannot be synthesized de novo by the human body at rates commensurate with demand and must be obtained preformed from the diet. Six examples include Leucine, Isoleucine, Lysine, Methionine, Phenylalanine, and Tryptophan (along with Valine, Threonine, and Histidine).

Biologically Complete Proteins and Supplementary Action: A protein is termed biologically complete (or a first-class protein) when it contains all the essential amino acids in adequate proportions and amounts necessary to support human growth, tissue repair, and maintenance (e.g., egg albumin, milk casein).

Supplementary action of proteins refers to the nutritional phenomenon where two or more incomplete dietary proteins, each deficient in a different essential amino acid (limiting amino acid), are consumed together. The amino acid surplus of one protein compensates for the deficit in the other, raising the overall biological value (BV) and net protein utilization (NPU) of the mixed meal.

Daily Life Example: In the traditional Indian staple diet, the combination of cereals (such as wheat or rice) and pulses (such as dal or lentils) illustrates this principle. Cereals are deficient in lysine but rich in methionine, whereas pulses are deficient in methionine but rich in lysine. When consumed together in a single meal (e.g., Khichdi or Roti-Dal), they provide a complete amino acid profile. This principle forms the operational nutritional foundation of India's PM POSHAN (Mid-day Meal Scheme) and Integrated Child Development Services (ICDS).

Cervical Cancer: Screening, Risk Factors, and Prevention

Screening Methods:

1. High-Risk HPV DNA Testing: Molecular detection (e.g., Hybrid Capture 2, PCR) of oncogenic HPV strains; standard primary screening modality recommended by the WHO for women aged 30 and older.
2. Cervical Cytology: Conventional Papanicolaou (Pap) smear or Liquid-Based Cytology (LBC) to identify premalignant dysplastic changes (Bethesda system: LSIL, HSIL).
3. Visual Inspection with Acetic Acid (VIA) / Lugol’s Iodine (VILI): Cost-effective, point-of-care screening methods that produce identifiable acetowhitening or mustard-yellow non-staining areas at the transformation zone.

Risk Factors:

• Persistent infection with high-risk oncogenic HPV types (predominantly HPV-16 and HPV-18).
• Early age at marriage/first coitus (<18 years) and early childbearing.
• High parity and multiparity.
• Multiple sexual partners or partner with high-risk sexual behavior.
• Tobacco smoking (metabolites concentrate in cervical mucus, impairing local Langerhans cell immunity).
• Immunosuppression, particularly HIV infection.
• Long-term use of oral contraceptive pills (>5 years).
• Low socioeconomic status associated with poor genital hygiene and lack of access to screening.

Preventive Strategies:

• Primary Prevention: Prophylactic HPV vaccination targeting adolescent girls aged 9–14 years before sexual debut using quadrivalent/bivalent or indigenous quadrivalent vaccines (Cervavac); promoting barrier contraception (condom use) and tobacco cessation.
• Secondary Prevention: Population-based screening integrated into primary healthcare via the National Programme for Prevention & Control of Non-Communicable Diseases (NP-NCD), coupled with immediate "screen-and-treat" protocols using thermal ablation, cryotherapy, or Loop Electrosurgical Excision Procedure (LEEP) for pre-invasive lesions (CIN II/III).
• Tertiary Prevention: Prompt staging, radical surgery (Wertheim's hysterectomy), or concurrent chemoradiation for invasive disease to minimize morbidity and mortality, structured around the WHO global cervical cancer elimination strategy (90% HPV vaccination, 70% screening coverage, 90% access to treatment).

Targeted urological interventions, community-level balanced dietary strategies, and programmatic screening and vaccination align clinical practice with national health outcomes.