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Contributor score: 4

 +1  (nbme21#26)

Retroperitoneal structures: SAD PUCKER.

Only the descending colon is part of this.

 +1  (nbme21#45)

Pyruvate Kinase defect leads to decreased ATP leading to rigid RBCs and extra vascular hydrolysis. Increased levels of 2,3-BPG decreases hemoglobin affinity for O2.

 +1  (nbme21#20)

Rabies Virus (rhabdoviridae)

Fever, encephalitis, drooling

 +1  (nbme21#23)

I believe its Squamous cell carcinoma. Its centrally located, smoker, and its a hilar mass. Keratin pearls.