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What is Pacman dysplasia and explain in detail?
Pacman dysplasia  is a lethal autosomal recessive skeletal dysplasia.  The dysplasia is present during fetal development.

References
Wilcox WR, Wenger DA, Lachman RS, Rimoin DL (2005). "Distinguishing Pacman dysplasia from mucolipidosis II: comment on Saul et al. [2005]". Am J Med Genet A. 135 (3): 333. doi:10.1002/ajmg.a.30717. PMID 15887286. S2CID 38848656.
Saul RA, Proud V, Taylor HA, Leroy JG, Spranger J (2005). "Prenatal mucolipidosis type II (I-cell disease) can present as Pacman dysplasia". Am J Med Genet A. 135 (3): 328–32. doi:10.1002/ajmg.a.30716. PMID 15887289. S2CID 2151584.
Wilcox WR, Lucas BC, Loebel B, Bachman RP, Lachman RS, Rimoin DL (1998). "Pacman dysplasia: report of two affected sibs". Am J Med Genet. 77 (4): 272–6. doi:10.1002/(SICI)1096-8628(19980526)77:4<272::AID-AJMG4>3.0.CO;2-P. PMID 9600734.
Shohat M, Rimoin DL, Gruber HE, Lachman R (1993). "New epiphyseal stippling syndrome with osteoclastic hyperplasia"